Here are three shots taken within a few moments of each other, with three different lenses, one being the 16mm.
OK now...don't read anymore---which is the 16? (maybe silly question), which is the sharpest?, which is the fastest? i,e, biggest aperture?
now, the 16 I find a funny little beast, it can be crisp, even wide open:
OK now it's prolly obvious the first shot up there is the 16 at 2.8. The faces, where my AF blinked are fine but not really crisp at all. However, here is a 100% on the cast:
So the AF has lied! The POF is on the cast, not the faces. I think this might explain some of the complaints about it. Maybe the continious AF kept going, I don't know, and it has to be more tricky wide open anyway.
But if you are shooting wide open you might try MF and see if you get sharper.
#2 nFD 24mm at f/2
#3 summilux 50mm at f/1.4
best to all, nice shots up there!