I received mine at work earlier today from Amazon. Just got to snap some pics while the sun was still up. I'm totally loving it. Never owned a nifty fifty but I did borrow one for awhile. Like everyone has said, the build quality is 10x better. Actually feels very similarly built as my 28 f/2.8 IS USM minus the crinkle finish. It's also almost as heavy as the bigger 28 IS. The focus ring is smooth but light. The AF is much much quieter than the 50II but still has a noticeable whir sound and is definitely not as quiet as the 28. And the pictures are typical prime sharp. OOCJ, even wide open, it's sharper than my old EF-S 17-55 IS and my 24-105L. But stopped down to 2.8, from the couple dozen shots that I've taken, it's as sharp as my 85 1.8. I'll go through the RAWs later and report back. But I'm definitely happy with it so far. And my copy doesn't seem to need MF. Probably the best $125 I spent this year. Except for the Macallan 18.
6D ☺ G7 X Mark II ☺ SL1 ☺ EF-S 18-55mm f/3.5-5.6 IS STM ☺ EF 28 f/2.8 IS ☺ EF 85 f/1.8 ☺ Rokinon 8 f/3.5 ☺ EF 24-105 f/4L IS ☺ EF 70-300mm f/4-5.6 IS ☺ EF 50 f/1.8 STM ☺ EF 24-70 f/2.8L II