Most fundamentally:
Gains:
Better image quality
Better high ISO performance
Losses:
Worse AF
Lower FPS
Less reach, although slightly higher MP count gives a bit more scope for cropping
Depending on what lenses you have - no EF-S support and will expose weak lenses more
I had a 50d before is the af like that again?...?
5D3 and 1Ds2/3 are true upgrades from 7D
5D3 and 1Ds2/3 are true upgrades from 7D
You do remember 50D AF, don't you?
Depends how you look at it or what you want from a camera.. the fact is both are excellent cameras - the 7d is newer technology but the 1 series camera's are built like tanks and have plenty of features that the 7d does not haveSo a Canon 1dmk2 is better than my 7d.....?
As you say the 5d3 is quite a lot more expensive than either a 5d2 or 6d.
However the 5d2 is ruled out because it's comparatively old tech and the 6d is ruled out due to lesser build.
What does that leave you with?
The 6D and 5S2 are pretty close, but I personally chose the 6D for it's slightly improved AF and the newer sensor which provide two-thirds of a stop better low light performance. The 5D2 does have better build quality (the 6D isn't bad), and takes a CF card instead of SD (important to some but I prefer the convenience of SD), but the 6D edges it within most other departments. For me, the 6D was the better choice, and with HDEW currently selling them for £1139 (body) or £1579 (body + 24-105L) they are very well priced.So would you guys completly rule out a 5dmk2 then? I want the build quality! Thats a must, But i need to go FF now and the mk3 is out of my reach currently.
I have both a 7d and a 5d2. Build of both is very similar, and it's handy being able to swap batteries at times. My main lens on the 7d was the 24-70l 2.8 as I got it at the same time. It does 'feel' better on the 5d2 though, getting the usage of the full frame sensor rather than the crop just seems to provide more natural results. I don't know if that's because I had a film dslr for a couple of years before going digital.
I use the 5d2 most of the time and have kept the 7d for use with my longer lens. I can't say I have been affected by a difference in AF or frame rate performance but I'm not shooting sports.
The 6d is an improvement on the 5d2 other than an apparent step back in build. That will matter to some but certainly not everyone. For what it's worth I wouldn't sell my 5d2 to buy a 6d, but if I had the extra cash I would get a 5d3.
1D's are for people who treat their equipment hard, or who don't mind carrying a large lump with them. They offer great build and perfromance, but are a bit big for non-Pro use.
So would you guys completly rule out a 5dmk2 then? I want the build quality! Thats a must, But i need to go FF now and the mk3 is out of my reach currently.
What do you shoot that needs full frame?
You mention the noise gains - but the 5DII auto focus gets worse as the light drops...
Just for the record you don't need to treat 1D like dirt, but it's nice to know a little splash won't finish it for good.
Landscapes, Weddings now and then as a second togger
I don't have a problem with the af on the 5d mkii. Kids and dogs running around like lunatics and also no problems shooting the eurofighter typhoon last summer. I don't think the af is as bad as people make out.
I'm glad I'm not the only one who's never had a problem with it!![]()
I'm going to the Cosford air show at the weekend, the way people go on about the 5dmkii af anyone would think I'm just going to get pictures of the clouds.

what about the 1ds mk3 ?
full frame goodness with a high pixel count better auto focus the the 5d 2 and of course 1d build quality
i don't think you would go far wrong if you can find one at a good price
II don't think the af is as bad as people make out.