The 14-24 can't use filters... So I never had much use in using filters until my recent trip to Chicago. I really loved the shots from my 28-70 and Circular Polarizer, as well as the few I took with the 10-stop ND filter. I'm a lot happier with my 28-70 shots because they have nice blue skies, where the 14-24 seem to be a bit blown out sometimes. Since I'll be studying in Europe this summer, I'll be doing tons and tons of landscapes, and really want to make a decision in the next month or so. I currently have the 14-24 and the 28-70 I'm debating doing the following (all used lenses probably) Option 1: Sell 14-24 (about $1500) Purchase 17-35 (about $1100) net gain $400 Option 2: Sell 14-24 (about $1500) Sell 28-70 (about $950) Purchase 24-70 (about $1500) Net gain $950 Option 3 Sell 14-24 (about $1500) Buy 20mm 2.8 ($400) Buy 62mm --> 77mm step up ring so I can use my filters ($25) net gain $1075 Option 4: (you tell me what you'd do) I'm not sure if 20mm is wide enough for me, or even 24mm, I'm leaning towards the 17-35, but I'm curious what other people think. Thanks.