According to Canon, the RF 50 1.8 is significantly softer than the EF 50 1.8 and RF 35 1.8.
EF vs RF (RF mirrored for comparison):
35 1.8 below:
Admittedly the EF 50's chart seems incredibly optimistic, but if we compare it to the 35 it's basically softer across the entire frame. I will wait for reviews and more sample shots (there are some pretty limited ones here) but the more I see about this lens the less optimistic I am. May still replace my Sigma 50 EX but I've been mulling getting the Samyang 50 XP and I think this just pushed me over since I'm not in the RF 50 1.2's tax bracket. Also still holding out hope for the Samyang 45 1.8 to get ported over but w/e. Thought this would be useful to you guys
EF vs RF (RF mirrored for comparison):
35 1.8 below:
Admittedly the EF 50's chart seems incredibly optimistic, but if we compare it to the 35 it's basically softer across the entire frame. I will wait for reviews and more sample shots (there are some pretty limited ones here) but the more I see about this lens the less optimistic I am. May still replace my Sigma 50 EX but I've been mulling getting the Samyang 50 XP and I think this just pushed me over since I'm not in the RF 50 1.2's tax bracket. Also still holding out hope for the Samyang 45 1.8 to get ported over but w/e. Thought this would be useful to you guys