I need some advice.
I'm starting to think about my next lens. The equipment doesn't make the photographer, but L-glass is the standard for most professional photographers for good reason.
I would like to have a workhorse portrait and performance photography lens. My current lens is the Canon 75-300mm IS and I shoot with the 20D. The standard portrait L-glass lens has been the Canon 70-200 mm f2.8 IS. I've rented it for two days and I'm testing it by photographing the play (Chicago) at my wife's school. I have to photograph from the auditorium and no flash is permitted. The lens is heavy, it's expensive ($2300), but it shoots quite fast at f2.8, though I have to be careful in focussing with such a low depth of field. There is a difference between my previous images and the ones I'm getting now.
Here's my dilemma.
Canon has a new 70-200 mm f4 IS lens. It's half the price, the reviews say that the optical quality is equivalent to the f2.8, it's well built and it's extraordinarily light. It also has Canon's new stabilizing technology that stabilizes the lens up to 4 stops. I can't find a place that will rent the lens. It's too recent. Question is: "Will I miss that one stop difference" ? The forums are full of people who say that they're selling their f2.8 lens for this one because it's easy to hold and to travel with. I don't know if I should believe them.
Finances will obvious play a role in which one I eventually buy, but I would appreciate your input.