It looks like the 5D has some strong advocates, I hope I can do it justice.
I have 4 lenses at my disposal, a 50 f1.4, a 24-70 f2.8L, a Sigma 12-24 and a loaned 17-40 f4L.
The 24-70 has always perfomed superbly on the 1DN, its sharp, contrasty and will now be wide!. It balances well on the 1DN, so i'm hoping it becomes the defacto lens for the 5D, especially for walkabout and landscape work.
The 50 f1.4 will be great for discretional use, making the package very compact (by 1D standards). I see this lens very much as challenge, with more footwork and thought going into composition.
I've got so accustomed to using zooms, that (up until last year) I treated 50mm as a "always keep it in the bag" and and get it out for low light situations lens.
However, reading some of OPF's earlier threads and knowing Asher and others are great advocates, it will be quite refreshing and educational to see how I will look at things through a fixed focal length, now akin to our natural field of view.
The Sigma 12-24 was bought to provide wide angle capability on my earlier 10D and 20D. Its a very capabale lens (Nicolas Claris more than proves this). I find it a little slow and may be overly worried about edge softness on FF.
1.6 crop cameras worked within the Sigma's sweet spot so depending on how it performs I may well trade it in for the 17-40. One thing for sure, if end up keeping it then I may need to get a longer remote to keep my feet out of the viewfinder
No doubt the 5D will exceed my expectations and together with the complimentary 1DN, I think I'll sit with this combination a few years to come.
Ironically, I asked both Asher and Michael Tapes over a year ago their views on whether to get a 5D or 1DN and both concurred that the 5D was their preference, however they already owned a 1DN.
I look forward to posting some shots of Amsterdam using all lenses for comparison.