I would like to have a wide-angle lens but not sure which one. I am puzzle of which lens is best suited for me. Currently, I have a 7D and will be getting a 5dc/1dII soon. If the money is a not problem, I would get both. Since my budget does not allow me, I would think 17-40 will be better for me so that I can use on both cameras. Does anyone have the same dilemma or any ideas/recommendation?