When buying, there was a choice between two, both were with the same exhaust. Whoever takes it and thinks that 1.4 is a panacea for a dark room, then you are mistaken. Yes, L class glasses, but working apertures, I repeat from 2.8. And he also has a rough focus adjustment step, i. E. in the camera you can not correct the back or front focus, you just won’t get to the right value. In general, I use it, the picture from it is very decent, I put a CROSS on 1.4-2.5. By the way, 50 by 1.4 is sharp, yes, but in street lighting. Now think 14 thousand against 40 because of the unnecessary (but I would like) aperture ratio and the wider angle.
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