Hi,



I have the following lenses:

Sigma 10-20mm

Sigma 30 1.4

Canon 50 1.8

Tamron 17-50mm f/2.8

Canon 100mm f/2.8

Canon 85mm f/1.8



And I've got 40D and 5D Mark II.



I'm wondering which lens I should keep and which to sell. Is it worth
replacing the zoom lenses to equivalent 17-40 (for 10-20) and 24-70
(for 17-50) in FF? Will I see a difference in IQ?



I'm thinking of using 5D with prime lenses get the nice shallow depth
of field and 40D for zooms as I already have. Does this make any sense?



Few lenses I have an eye on are



1. 70-200 F4 IS. I don't like the weight for 2.8 although, I've seen some great shots with it.



2. Replace Siggy 30/Canon 50/1.8 with Canon 35/1.4 or Sigma 50 1.4. Which do you guys use on FF?



3. 135L, it very nice lens I had a chance to try. Not sure if I should
spend a little more and get 85L instead. I can't afford to get both.
What do you guys recommend?



Darren