This is the best post I have seen comparing two "higher end" HDMI cables. It is not the best translated page from google, but the picture comparisons are something to see.

http://monolith-theater.net/hal/?p=2410

I see a difference between the images. In the first picture, upper left corner, I see more detail in the "fire" than image number 2. The "death star like" orb shows different warmth levels. Also, the bottom two pictures show ever so subtle color shifts.

Do you guys see the differences?

SC-05, HLT6189, Oppo BDP-93, Blue Circle Audio FX2
Axiom M2v3's, QS8v3's