1 looks very good 2&4 ok 3 grainy possibly due to cropping/enlargement? You will likely find the lens has a sweet spot both in FL and F stop. Should be a very flexible peice of glass! Best wishes.
Image 3 is a standout. It's got that melancholic and nostalgic feel to it. I feel it's more to do with the saturation rather than the grain, although, the grain does help.