Which SS has a better picture? Kowa TSN-663 vs. Pentax PF-80ED-A

[davester00]

Both optics are in the same price range after you add a 20-60x eyepiece.
Weight and size is not a concern to me.
Which optic do you think would have a better picture at 500 yards?
A) Kowa TSN-663
or
B) Pentax PF-80ED-A

Let me know if any of you guys have had a chance to look thru any of these spotters side by side and which one did you feel was better than the onther and why?

Thanks in advance.