The F-35 Lightning II and the Su-57 Felon are among the world’s most advanced combat aircraft, representing the pinnacle of American and Russian fighter design philosophies.

On paper, both are fifth-generation stealth fighters capable of carrying weapons internally, evading enemy radar, and engaging targets across multiple domains. Yet they were built with very different priorities.

The F-35 was designed around stealth, networking, and battlefield awareness, while the Su-57 emphasizes speed, maneuverability, and long-range air combat.

So which aircraft comes out on top? To answer that question, it helps to compare them across five critical parameters: stealth, sensors, air combat performance, strike capability, and operational maturity.

Stealth: F-35’s strongest weapon

Stealth is arguably the defining characteristic of a fifth-generation fighter, and this is where the F-35 enjoys one of its biggest advantages.

The aircraft was designed from the outset to minimize its radar signature. Its airframe, engine inlets, weapons bays, and radar-absorbent coatings work together to reduce detectability. Open-source estimates place the F-35’s radar cross-section at roughly 0.001 to 0.005 square meters.

The Su-57 incorporates stealth shaping and radar-absorbing materials but makes compromises in favor of aerodynamic performance. Most estimates place its radar cross-section significantly higher than that of the F-35.

While the Su-57 is certainly harder to detect than older Russian fighters such as the Su-35, the F-35 remains the stealthier platform.

Sensors and situational awareness: Information is power

Modern air combat is increasingly about who sees whom first.

The F-35’s sensor suite combines inputs from its AN/APG-81 AESA radar, Electro-Optical Targeting System (EOTS), and Distributed Aperture System (DAS) to create a single, fused picture of the battlefield.

Pilots receive information without having to interpret data from multiple sensors manually. This sensor fusion capability has often been described by pilots as the aircraft’s greatest strength.

The Su-57 carries the N036 Byelka AESA radar and multiple infrared search-and-track systems, giving it impressive detection capabilities. However, much less is known about the sophistication and maturity of its sensor-fusion architecture.

Most analysts agree that the F-35 currently sets the benchmark for situational awareness among operational fighter aircraft.

Air-to-air combat: Su-57 fights back

The Su-57 begins to shine when discussing raw performance.

The Russian fighter is faster, with a top speed exceeding Mach 2, compared to the F-35’s Mach 1.6. It is also equipped with thrust-vectoring engines, enabling extreme maneuvers that few aircraft can match.

These capabilities could prove decisive in a close-range dogfight.

The F-35 was never intended to be a traditional dogfighter. Instead, it was designed to engage threats at long distances before opponents can respond.

Nevertheless, if combat were to devolve into a visual-range engagement, the Su-57 would likely hold an advantage thanks to its superior agility and energy performance.

Strike capability: Built for modern warfare

The F-35’s multirole design allows it to perform a wide variety of missions, including air superiority, precision strike, intelligence gathering, and suppression of enemy air defenses.

Its ability to carry precision-guided weapons internally while maintaining a low radar signature makes it particularly effective in highly contested environments.

The aircraft can also share targeting information with other platforms, effectively acting as an airborne command-and-control node.

The Su-57 is capable of conducting strike missions as well, but the F-35’s combination of stealth, sensors, and networked warfare capabilities gives it a notable advantage when attacking heavily defended targets.

Operational maturity: Numbers tell the story

One of the biggest differences between the two aircraft is their operational track record.

More than 1,200 F-35s have been delivered worldwide, accumulating hundreds of thousands of flight hours across multiple air forces. The fighter has participated in real-world operations and continues to receive regular upgrades.

The Su-57 remains in the early stages of deployment. Publicly available figures suggest that fewer than 50 aircraft have entered service, and its combat experience remains limited.

The F-35 wins this contest.

Verdict: Different strengths, one clear winner

The Su-57 is a highly capable fighter that excels in speed, maneuverability, and close-range air combat. It represents Russia’s most advanced fighter program and remains a formidable aircraft.

However, modern air warfare is increasingly dominated by stealth, sensor fusion, networking, and the ability to detect and engage threats before being seen.

Across those areas, the F-35 consistently demonstrates stronger performance.

While the Su-57 may have an edge in a traditional dogfight, the F-35’s superior stealth, battlefield awareness, strike capabilities, and proven operational record make it the more capable overall platform.

In a contest defined by the realities of modern warfare rather than air-show maneuvers, the F-35 emerges as the stronger fighter.