The performance of fighter engines are the result of many trade off. Some of the major one are reliability, fuel economy, and thrust. Given the pressure that is being placed upon F35 to get costs down. That may have resulted in slight reduction in average thrust to gain advantage in other two areas that reduce overall costs. Overall I find it impossible to really judge performance of engines based upon claims by manufacture because we have no idea what the trade offs were made in coming up with those figures. That’s why you can have two engines types that appear to perform close to each other by stats but in real world you find one clearly better then other.
Furthermore, these performances are often measured using a not moving bench, at sea level, 25°C etc. Values greatly vary depending on speed of the aircraft, altitude, barometric pressure, etc.
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