Nonsense, if you want a good result after post production it's better to start with great and realistic colour.
Is that my original Colour good? All shooting with 17-55 @ f2.8
BeforeEdit by ChongKiat, on Flickr
I can get such result just tweak a little in Lightroom , and get this result , so does colour really make different from 17-55 & the 17-40mm L ? If u are shooting in RAW , after import to lightroom , ur photo is become nothing , everything would be EMPTY , how saturate u saw in ur DSLR SCREEN isn't equal to ur MONITOR screen because all the colour will become DULL and Un-Saturated
IMAGE LINK: http://www.flickr.com/photos/chongkiat/11011451935/
after-edit by ChongKiat, on Flickr