So I've been perusing the web and so far this is my (humble) impression of the images I've seen from this lens, albeit based only on viewing the various web images posted. So while not definitive, I do have an impression forming and it is -- not hugely positive compared to the 50/1.4G and 50/1.2 AIS manual. Let me explain further…
First, what I see in the 58 is nice far bokeh at f1.4; slightly busy front bokeh wide open at f1.4, and not overly crisp resolution on any plane at f1.4. Wide open, I think overall it renders a little better than the 50/1.4G (not nearly 4x the cost better though) but not even in the same ballpark as the 50/1.2 AIS. The latter being sharper in the central focus plane while having similar bokeh, and of course f1.2 appears to render enough of a thinner DoF than the 58 at f1.4 that I find it a more desirable overall look wide open.
Next, at f2, 2.8 and 4, it appears to render about the like the 50/1.4G, and in fact the 50/1.4G may have better contrast by f4 which also generates the impression of more crispness stopped down. In the f2 - f2.8 range I'd call it a wash between the 50/1.4G and the new 58. From f4 up, I prefer the 50/1.4G from both the wider focal and overall image rendering characteristics of the two lenses. Still, the 50/1.2 manual blows them both away from f2 up being both sharper and crisper with balanced contrast and pleasant bokeh. In a nutshell, I see this new 58 giving a smooth but otherwise unremarkable rendering of images.
I'll need hands on testing to confirm those above impressions, and I welcome any images that prove these impressions wrong -- in fact, I WANT To be shown examples that prove me wrong! So take this for what it is, only an initial impression -- but an impression that leaves me not having seen anything as of yet that makes me want this lens...
Flamesuit donned! :talk028: