Still rocking a 20+ year old 50mm 1.8 first version. Build in Japan with the metal mount. Clean, fast , reliable & sharp. Only fault is the 5 blade shutter makes crappy bokeh. I am waiting for a reason to replace it. A $1,200 lens, even if it's 1.2L is not a good enough reason. A 1.4, for $400, even if a tad sharper in the after 2.8 is not a good reason. a 2.5 with 1/2 frame macro, and sharp, for $500 was a good reason. So I bought one of those too. I'm really hoping for a hyper-sharp 1.4 with IS that does not break the bank. Guess I will be holding onto that 1.8 until the first price drop on any new 50mm
The 1.8 Mk I truly is a brilliant little lens, I'm very happy with my immaculate copy
I don't find myself using my 50 mk I anymore since I got the 40 pancake. Since I am not an agent in The Matrix, I do not notice a large problem with focus speed on the 40.