Hello, I am looking to purchase the 70-200 F4 L series lens. I do mostly landscape photography and most of the time at the beach. No low light shots, but sometimes overcast. I am shooting with the 18-55 non IS right now. The lens has some issues that I was told it would have to be taken totally apart to be fixed. Instead of spending the money for this I was wanting to just purchase another lens. A lot of my images I end up modifying using photoshop and topaz labs. Because these images are being modified, would purchasing an "L" series lens be counter productive. From my research I am aware that the "L" series glass provides more crisp, clear and outstanding color saturation, however if I am manipulating the image would those attributes be wasted? Thank you for your help!
5D-2 Mark ii 

