where you find your mtf test shows GF50 at f4 is sharper for GF120 at f4 where you find gf50 at f5.6 sharper for gf45 at f5.6? gf45 at f2.8 even a bit sharper vs gf50 at 5.6 in real world photos. i have gf45,gf50 and gf120. GF120 at f4 smokes both gf45 and gf50 at any f aperture. https://blog.kasson.com/wp-content/uploads/2021/06/gf-all-primes-mtf50.png there are world famous lens testers as Jim from pcmag.com and noname kassons
where you find gf50 at f5.6 sharper for gf45 at f5.6?