Anyone having compared, say
Hexanon 50mm/1.4 with
Hexanon 50mm/1.7?
The latter is said to be of
Ultimate sharpness™…
Or rather: any Hexanon 50mm/x.x
versus the f1.7?
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Oh, @afre,
then you should see my Opinels, or
my Spyderco “Superblue”…
Well, I have not tested the Hexanon, but I owned and tested a lot of 50mm manual prime lenses of the 60’s and 70’s. The best lens that I tested in terms of sharpness is a Yashinon DX 50 - 1.4. . The Yashinon seems very similar in construction to the Hexanon, same number of optical elements (7 in 6 groups), same weight, same aperture blades. Of course, the sharpness improves a lot if you close a bit the aperture. It is not fair to compare the sharpness of a 1.7 with that of a 1.4 at full aperture. If you use both say at F 4 the 1.4 outperforms the 1.7. However, sharpness is not the only parameters as you may know better than I. In this regard, I like very much my Yashinon which I use often with my Sony. Fujinon and Takumar are comparable and only marginally worse than the Yashinon. To be precise, the resolution I measured with my Yashinon gets down to the order of the sensor pixel size, so it is not a limiting factor. More important is proper focusing which may be challenging with a manual lens 
. This chat may become long at this point, and I am not sure how many frequenters of this site could find it interesting …
Bottom line, if you find one of these lenses at 30-40 euro/dollars, buy it and enjoy it. It is also a lot fun to clean and repair them …
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50mm/f1.0 from Fuji. Clearly the bestest 50mm on the market
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Thank you, @darix
Have you seen its price tag? Gulp.
I can get approximately 100 Hexanon AR 50mm
lenses for the same amount…
/Claes
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That must be what makes it the bestestest! 
the light transfer wont get better if you stack 100 50mm lenses in front of each other
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Maybe not vintage, but I love my Nikkor 50mm f/1.8 Series E lens. (I also have the 100mm f/2.8 and 70-210 f/4 – I love them too).
Sorry, the 50mm f1.7 is not part of my collection (yet) 
.
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That’s next on my list. I’ve got the Fuji 56 f/1.2 and just never been that wowed buy it.
On my Nikon stuff I’ve had a few version of their 50mms over the last 20 or so years. Currently have the 50mm f/1.4 AF-S and while it’s stellar on lower resolution sensors it feels meh on the D800 and D850. Been looking at a Sigma ART to replace it as those seem to do better. F-mount stuff is getting cheap.