@tbrbn Thanks
I will play around with the mark sharp / autosmooth later 😀
About the corner, yeah I guess it’s okay’ish and if textured and viewed from a little bit further away not really noticable.
About the pole: Yeah that’s what I thought too and I tried insetting the face before… this makes the problems even worse:

This is the inset I created for testing purpose.
And more clear without the wireframe visible:

Creating a supporting edge loop around the sides doesn’t improve it either. This is driving me nuts as I can’t imagine it beeing that hard to subdivide such a simple shape 😀