I wanted to buy this lens but now I don't know what to do, if this is what you get even for 500 euro I don't want it
I know what you mean. There's no doubt that the MarkII is an improvement on the original, but it's still seems to be plagued by softness and vignetting at the edges and corners of extreme shift.
The dpreview treatment of this lens in their review is superb. I don't recall ever seeing before such a thorough examination of lens performance. They give you a graphical illustration of how the MTF changes from centre to corner as the lens is stopped down. The good news is, this lens really is sharpest at and near full aperture, say F3.5 to F4. However, at maximum shift, at full aperture, edge performance looks really bad to me.
At F16 it's much improved, but of course centre resolution then becomes much worse. You can't have your cake and eat it, I guess.
I've owned a TSE 24 for a few years now. I found it useful for stitching with my cropped format cameras in the days when stitching programs were not nearly as good as they now are. When I first tried the lens on my 5D, for stitching purposes, I got a shock. The extreme edges on both sides of the panorama were so bad I returned to the site the next day and reshot the scene using my 20D, standing further back.