While I've never owned a 5DII, the only thing I ever heard real complaints about was the auto-focus...
The lack of any meaningful improvement in the autofocus in the 5Dmk2 versus the 5Dmk1 was tremendously disappointing IMO, and that factor, plus a very negative Antarctica trip report (circa Jan 2009?) where a bunch of them croaked ... spin attempts to blame it all on 'Operator Error' didn't pass the smell test when it was found that basically no other cameras failed ... was enough for me to pass on the 5Dmk2; ended up with the 7D instead.
Why do you think that the 7D is better?
Basically, Canon said as much when the 7D came out.
The raw cost of the FF sensor is roughly 10x's that of a standard 1.6 Crop sensor. From a silicon wafer they can produce 200 1.6 sensors, from that same wafer they get 20. There's your major price difference and why it's so much more money.
That math is wrong, since:
Canon 1.6x crop sensors: 22.3 x 14.9 mm (3.32 cm²)
Canon FF sensors: 36 x 24 mm (8.64 cm² )
That's only 2.6x larger, not 10x.
For a notional wafer that produces ~200 1.6x sensors, it would yield ~77 FF wafers... if we assume all yield issues are the same, etc, then if a crop sensor is $500, the FF version is $1500. Of course, elements such as yield aren't the same ... personally, if I were designing that wafer mask, I'd put a cluster of FF's in the middle (where yield is usually better) and then populate and build out to the edges with the smaller 1.6x sizes .. less edge waste, if nothing else (if even smaller circuits could fill in out here also depends on the wafer's processing steps).
I'm not familiar with what Si wafers are going for now, but $50 for an 8" is a reasonably conservative estimate...the raw material is literally 'free' in comparison to GaAs and GaN (which can be $50K for a 4")...its final cost really comes down to the process steps, including precious metals content, and overall yield.
I'm a little bummed it went up.. what, $700 for the body - but I'm not surprised that it went up. Keeping the body around $3K would have been quite welcome for sure.
The 5D originally sold for $3299. Given all of the region's recent woes ... Tsunami, Earthquakes & Floods ... it isn't a huge surprise to see a modest bump.
It is a lot for an amateur to swallow.
Yeah, but try looking at the sticker on Canon's new 200-400mm with integral 1.4x converter: $11K MSRP.
Suddenly, my fantasizing for a 400mm DO IS doesn't seem so farfetched.
-hh