Well you have picked some good examples to make it difficult Really is everything a 50mm, a few look 100mm macro to my eyes.
Since we are in canon forum , are we looking at canon 1.4, 1.8. 1.2L and sigma 1.4 & 1.4 art... any nikons in there ? have you compiled the exif date from each of the shots? we can look at afterwards
No more clues, just 50mm. The only additional info I have is which lens it was, I had each open in a browser window but closed them when nobody rose to the challenge, I might be able to find a few more details for some of them.
Obviously you are being trusted not to cheat :-)
P.S. Mackguyver, sorry for the diversion. For a little perspective I owned and used an FD 50 f1.2L for many years and simply loved it, when I moved to EOS I eagerly anticipated the arrival of the 1.2L and used the 1.4 in the mean time. When the 1.2 did eventually arrive I was not impressed, I tried to like it but didn't.
I am not a fast prime hater by any stretch of the imagination, the 85 f1.2 is peerless, but I feel too often wild claims are made that just can't be backed up. I have said many times that if you shoot more because your lens has a red ring then that alone is a good enough reason to buy it. But to claim some of the stuff in this thread from in line images really is gilding the lily, and truthfully doesn't help informed purchasing decisions.