Not hugely. I'm fully aware that
I'm the main limitation in my use of my 5D (classic) which is my main workhorse.
Bought it in 2006 at the limits of my budget largely because I wanted a full-frame viewfinder. I'd gotten used to it with my film SLRs and hated the poky view on the 300D that I owned at the time, but that had served its purpose well, so I had no regrets. The other stuff that the 5D delivers was a bonus, especially the higher ISO performance. I bought it with the intention of keeping it for five years or so and it's still a great camera.
I did then find that the 75-300 IS lens I had was mercilessly treated by the 5D, so that got replaced by a 70-200 f/2.8L IS (it was that or a Corrado G60 to replace my Scirocco, but the running costs of the lens are lower

).
I'll probably wait until the 5D MkIII appears before replacing the 5D (or the oft-heralded EOS 3D which would go nicely with my EOS 3 film body). I'm occasionally tempted by a
second hand 1-series body, but the 1Ds is less of a low-light tool and the 1D is a 1.3 crop. And I do appreciate the ability to work without a grip when I want to. Maybe I don't know what I'm missing... ?
Sure, I'd like some 'L' primes. A 135mm f/2L and a 35mm f/1.4L would work nicely for some of the things I do. I fancy a 300mm f/4.0L IS for a bit of extra reach. Working on Arkady's principle, I'll get them when I can afford to and not bother with a cheap alternative. In the meantime I'll make do with what I've got.
Other than that, the areas where I do have equipment lust is at a completely different level. I quite enjoy using the cheap film rangefinders I have. It's a different experience to an SLR in the same way that shooting with my Yashica 124G TLR is a different experience again. It's refreshing to take an alternative approach to making photographs every once in a while.
I'd really like to buy a Leica M9. No chance of affording that, so I've been eyeing m4/3 with interest over the last couple of years, especially the GF1. I may yet get a Voigtländer Bessa R or perhaps a Leica film camera with an eye to using the lenses on both.
Oh, and a decent digital compact that I can keep with me at all times.
