I too like the 8x32 FL but I finally got a Zen 8x43 ED2 over the weekend and the Zen really is sharper. Let's say it splits the difference between the FL and the 8x32 SE.
Here's what else I've noticed:
Brightness: the Zeiss is amazingly close considering the difference in objectives.
Contrast: the Zen has the edge here. Really, really nice.
Color: the Zeiss may be a bit cool for some, but the Zen is warm and tending toward yellow. The SE and Pentax ED are also a bit warm, but not yellow like the Zen. If you want neutrality, you probably can't beat a Zeiss or Leica. I haven't looked through a Swaro in a couple years so I can't comment on that. My guess is they're very neutral these days.
CA: the Zeiss may have a small edge here, nothing dramatic. They are both superb.
DOF/3D: Zen is deeper, and the Zeiss always seems flat compared to other roofs.
Pincushion: I mention this only because in the Zen it intrudes a bit. Quite noticable, even close to on-axis. The Zeiss has it as well, but it doesn't intrude as much.
Focus: No comparison. The Zen is slow and (so far) stiff. My biggest beef in fact. The Zeiss is a birder's focus if ever there was. Fast, light, precise. A real treat in close quarters.
Accessories: Zeiss wins. Everything works. Personally I think the strap is more than a 20oz. bin needs, especially the heavy neoprene. I also prefer an everready case that slips off in the field, but the Zeiss case is super quality. The Zen objective caps are, of course, no good. The strap is long and rather shoddy. The hard case is nice but I doubt you can easily stow the strap in it. Cost cutting on Zen's part, but excusable.
Overall, Zen wins in the optics department: sharpness and contrast really stand out. An amazing achievement at the price. The Zeiss takes everything else. In all, two great bins with different strengths. It'll be interesting to see which makes it in the field with me more often. Something tells me weight/size will play a role.
Also, I'm already thinking of warblers and the thought of chasing them with the Zen's ponderous focus is daunting.
Mark