Likewise. As a wedding photographer (for whom the 5D3 looks like it's been custom made), the advantages over my 5D2:
> faster, more accurate AF
> much better low light AF
> dual cards
> up to 1 stop RAW improvement (a usable 6400 and 12800 will make a big difference in dark churches and reception halls)
> quiet shutter mode
> 6FPS - better for those moments where things are happening in a flurry
> much lower shutter lag (my PET HATE with the 5D2 - missing 'critical moments' because the camera's half asleep)
> better metering (not essential, but useful)
> better weather sealing (5D2 and L lenses can shoot in drizzle all day long, so 5D3 should be even more flexible)
Slightly OT, but the only 'advantages' the new D800 seems to have over the 5D3:
> 36MP - overkill (and in fact counter productive) for weddings (or just about anything unrelated to large print landscapes or studio work)
> better DR and low ISO (a great feature indeed, and hopefully one Canon will aspire to, but just not important for weddings - I can count on one hand the number of times I shoot under ISO 800 at a wedding)
> $500 cheaper (if you have to squabble over $500 for a camera body as a professional photographer, you should consider changing careers)
So yes, the 5D3 is worth every cent (and more) of the premium they're charging for it over the 5D2, and the D800.