I made some pictures for you.
You can find 4 pictures I just made over here: https://imgur.com/a/2Hd8qtm
First 2 pictures are from above, straight-on.
3rd picture is from the side, where you can clearly see the difference in length of the keys.
The 4th picture, also from above. I hold an envelope to the front of the keys.
Now it's clearly visible that there is some difference. Some of the keys are touching the envelope, some of the keys don't and are further 'back'.
I want to know of this is common. Maybe it's my OCD, but it annoys me when I look at the keyed from the front. The differences are clearly visible for me.
Does this happen a lot with pianokeys or are they supposed to be all signed out straight?
I still have 7 days to return the piano. So if this is a fault, I can return the piano.