I've done all the upgrades up to a Canon 5D with 35L, 85L, 135L, etc..... but as my primary subjects (kids) no longer like to have their picture taken by their geeky dad with geeky big camera I decided to sell them and now use a 450d with 18-55 IS & 55-250 IS kit lens.
Much smaller and I occasionally just use my 50 f/1.4 and 85 f/1.8 lens which I kept as they are relatively small lenses.
I intend to go smaller still to the Olympus E-P1 compact camera when it becomes available after the initial mad rush
