I'm no collector, so I'm not going to limit this to knives I own. (None of these pictures are mine)
ZT Makes the most beautiful full-production knives in my opinion.
ZT0561 - My Personal Favorite, much better looking and more functional design that an actual XM.
ZT0454
ZT0777
ZT0888
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I think the Tilt has the most beautiful clip, even though I hate the knife design.
I love the Southard from Spyderco, and Brad's customs are even nicer, tough the Spydie would be more than good enough for me.
There are plenty of others and customs are an entirely different matter. I honestly think there are too many beautiful pieces to call a winner, but my personal grail is a small Jasmine Flipper from Ray Laconico, made up with bolsters and s90v, sort of like this one.
More to come as time allows!