Thank you all for your helpful and elaborated feedback! I really appreciate it!
As you've assumed correctly I haven't applied "scientific" standards, just shot without using a tripod. However, sometimes this also works with other lenses
. I hardly ever miss a shot for example using my FA43 1.9
But you're right, to be sure I should use a tripod, the live view etc. I will get back with some more shots when this is done. Unfortunately my K-1 isn't here again so I could only use my K-30 to do some testing. Does this make sense? But center sharpness of the lens should also be testable when using a APS-C cam, right?
Actually some of my lenses are softer or lack contrast wide open. But stoping them down (often by just one stop) improves the image quality and sharpness significantly. My copy of the FA35 however needs to be stopped down quite a few stops to get really sharp in the center (at least judging from the view shots shown here in this thread). That's what really surprised me.
@Adam: Thanks for your comment as well! Yes, I shouldn't expect same image quality from the FA35 in comparison to the FA31. But at least, I wanna get as close as possible
.
The reason I sold the FA31 wasn't it's image quality. I really liked it a lot (
Lausbub ? Scallywag | the-living-years | Flickr).
But I hardly used it on APS-C. And I found out that when traveling (that's where 95% of my photos are made) I prefer to leave it at home since I'm afraid of damaging it on the journey...
So the FA35 came in handy due to its lower price tag
.