Frankly, I think the cat shot *is* rather soft, although it's hard to know how much of that is the lens and how much is due to detail being lost due to much of the detail being underexposed at ISO 1600, and a shutter speed of 1/30" not being fast enough to stop motion. Was that really taken with a Canon ike the EXIF says? If so, the lack of SR didn't help, either.
But if the point is that sometimes being a little soft isn't a bad thing, I have no argument with that! A lot of people deliberately soften portraits anyhow, and even for shots one would prefer a bit sharper, there is something to be said for lenses that make the shot *possible* in the first place. I recently observed the same about many of my shots, which similarly are are at high ISO with not quite fast enough shutter speeds to take full advantage of the sharpness of the lens. But the fact that I could get the shot at all is saying something about the value of these lenses.
Two more examples, both wide open at ISO 1600. First, from my M28/2.8:
Next, from the M135/3.5: