On paper but it sounds like the 30mm cannon was unreliable, the pilots mostly poorly trained and the situational awareness problems of the design from the poor fields of views from the cockpit were never rectified
And yet, fighting at high altitude (which is what it was designed for) I'd expect it to clean an Corsair's clock with ease because that big radial used in the Corsair and Hellcat was optimised for low/medium altitude combat, which was the norm in the Pacific theatre.
And for the record, I'm not claiming that the Bf 109K was necessarily "better" than the F4U - The F4U was certainly more versatile - but you said not
competitive and as an interceptor that depends entirely on what version of the Bf 109 we're talking about. The 109K was just as fast as the F4U-4, could out climb it and had a much more powerful armament. That sounds competitive to me...
Pilot quality is beside the point, I thought we were comparing airframes - otherwise lets talk about the Experten that flew the Bf 109K.