any one here upgrade from the sony fe 50 f1.8 nifty 50 to the rokinon fe 50mm f1.4, i recently got the 35mm f1.4 and f2.8 versions and i really like them, want to get the 50 but i already have the sony 50, is it worth the 400 dollar upgrade?? i realize the size is twice as big,,,,











