See this review if you haven't for reference, it's 24-70L VS 28-70L:


http://www.luminous-landscape.com/reviews/lenses/24-70-review.shtml


As I monitor the used market values, the 28-70L is sold @ $700-800 normally, and you can find a 24-70 for $900-1000 easily, $200 difference is subject to justify. Maybe you can delete the 50/1.4 and go for the 24-70L since this lens coverssuch afocal length, I personally do not use the 50/1.4 as it's not amazingly good wide open and the point of having such a lens is to use it at large apertures.