Somewhat OT:

My experience (from >100 2000mi flights on Jetstar A320s (which also seat 180 people) being 6ft and >300 pounds) is that the legroom on the ABC seats is slightly better than the legroom on the DEF seats.

The reason for this is that row 1 of the ABC seats is basically flush up against the forward left hand door but there is a bulkhead on the right hand side (because there is a small galley there and they want a workspace free of feet) and accordingly the DEF seats are set back quite a bit from the corresponding ABC seats of the same row.

As there are the same number of rows on each side of the aisle, this setting back translates to a tighter legroom all the way through the cabin. Even the row 12/13 exit row seats aren't quite in the same place as the corresponding ABC seats.