Hillsilly said:
Need? No. Want? Yes Please!
It's a lot of fun to play with new toys! Sure, I agree with most of the previous sentiments. Don't automatically expect a new camera to make you a better photographer blah blah blah. But, it's a lot of fun to think about buying new gear, checking out Canon Rumors to see what's coming out, and picking up the occasional new lens or body to see what they can add. I'm sure most people who visit this site would have a dream list of things to buy. I can't see anything wrong with that.
As with every rule there are exceptions. Moving to a 1d4 gave me full Manual with Auto ISO and good pictures at high ISO. Suddenly I was getting the pictures that my eye saw - so the content improved
The same with the move to the 5D and 5DII for weddings etc - suddenly the IQ significantly improved (yes I already had gone the L route )
My move to Digital from film improved things as I was suddenly able to experiment in a reactive environment - the shoot, view, change loop - so the pictures pushed the boundries and improved again.
So I would say that new kit can improve your photos - but only if it provides function/IQ that was holding you back.
Obvious if you need that function then you need the kit.
PS Am thinking of getting 16-35f/2.8 and 24-70f/2.8 to cover a week long Dickens festival for which I will be the offical tog.
The 16-35 will go on the 1d4 (suspect this will be the most used)
The 24-70 will go on a 7D
My 70-200 f/2.8II on the 5DII
Does this sound about right for what will be essentially a flash free intimate set of events?
I dont expect to change lens in an event, I might slip the 135f/2 on the 7D for some events (makes a good short f2 tele)