[davidmanze]

Read: they are soft.
I can see the point as getting a cheap but hopefully good lens, and also maybe challenging oneself by going full native, I mean, manual. In that case I would've gone for the Nikon, maybe the Olympus, but not the other two.

Exactly the full benefits come from using them on their native mounts ....... adding an adapter is really a hindrance .... so long live the (D)SLR ??

EDIT:
I was looking to find these last SLR lens reviews in the index a couple of days ago ...... I looked just now to find the new category.

"Vintage lens tests"..... it would be worth keeping an eye on how many visits they attract .....