There's a certain magic you get from the combination of the 1Ds3 and those 90's-00's lenses that you don't quite get with sony-based sensors and modern glass; the combination of canon's color science with the imperfect-yet-lush rendering of the lenses really does it for me. If I ever do upgrade, I'd just want more of the same but with the high-iso and dynamic range you get from sony-based sensors. Anyhow, what gear are you guys lusting over right now? If you couldn't tell, I'm a fan of fast primes with unique rendering, so the 200mm f/1.8 will always be my dream lens. As for more realistic options, I've been considering a wider lens for a while, maybe something like a 24L or 20mm ART. Only thing keeping me from getting one is I have yet to really need it enough in my day-to-day work to justify the expense.