I will very shortly be making the move to full frame by picking up the Canon 6D. My existing general purpose zoom is the rather excellent EF-S 17-55 2.8 but thats on my 7D so won’t be able to use that on FF. I’ve been very happy with this lens along with my EF-S 10-22 (which will probably be replaced by the 16-35 f4) but I need something equally good for the 6D.
My options at the moment are the new 24-70 F4 (with its reduced price) or the preowned 24-70 F 2.8 (not the newer version which is out of by budget), which means both lenses would be more or less equally priced.
My only source so far, apart from reading online views and reviews, has been dxomark’s scoring of these lenses when used on the 6D and it seems the 24-70 F2.8 (older version) is slightly better.
Can I get recommendations from those who’ve used both?
If it helps I usually shoot landscape and architecture and my 500px page in my signature shows you a sampling of this.



