sony 70-400 vs tamron 200-500

I have had what seems to be a very sharp tamron 200-500.  I just bot a sony 70-400 and I am finding it NOT as sharp.  have done a few tests - hand held and the sony is consistently a little darker and a little less detailed.

see attached.  and these are probably the 2 closest shots.  which do you think is better?

will probably order another 70-400 to see if they are all like this.  check detail on roof

sony

tamron