A totally un-objective, qualitative, subjective, opinion observation:
The Nikkor 50/1.5 wide open seemed to have more of a busy, "parallel" type OOF (some call it bokeh) than I expected. As an uncommon lens, I don't see images from it very often, and even less often do I pay much attention to lens character of those images. But this time I did and the OOF seemed a little "busy" as some call it. But, not near as much as a lens known for "busy" bokeh.
Now, the 1949 ZK is really something in this last post. Like many sonnars, it is sharp without seeming sharp. But there's something more to the image...not easily described. I like the OOF (bokeh) quite a bit more. Still a touch of parallel-ness, which actually kind of surprises me, but to be honest it just has that "sonnar quality" 🙄
Of course, I looked at all the images in this thread. Correctly guessing many of the challenges (but not all). Generally, I appreciate the "round", un-busy OOF (bokeh) and deceptive central sharpness (sometimes very sharp) of many of the older lenses.
Since I like this look, you would think I would also have a small collection of sonnars. But, looking through my lens cupboard, I see very few sonnars. My "go to" sonnar in 50mm is my 1957 J-3 that Brian shimmed (and whatever else he did to it). Supposedly not as good as a 1956 or earlier, but I wouldn't know. I'm just a poor caveman unaware of your modern ways. I do have to manage some minor focus shift wide open and close in. Part of the charm, right?
I thought about the new Lomo J-3+ when it came out. I'm glad I didn't. I rather wish I could acquire an early lens with good glass and enough integrity to be pampered into a "Brian-level" lens. But, with changing market dynamics and overall rising prices, I'm much less inclined to play the game and attempt an acquisition (or two/three). The good ol' days are over; so I'm told. 🙁
Brian, glad you got that Nikkor 50/1.5 LTM to help complete your collection. Nice!