I like Lenovo more than Dell so I would lean more towards the W530. However....
The ThinkPad W540 is expected to be released next month. It will likely be priced
higher because it is new, but it will have a 2880 x 1620 resolution screen which I believe is standard and it will have the latest Kepler Quadro graphics card. However, no info regarding exactly which models will be available (K2100m, K1100m, K610m, K510m), but I suspect the only the two higher end graphics card will be the options. It will also be slightly lighter if that means anything to you; 5.45lbs vs 5.71lbs starting weight.
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/laptop-computer-planet.com/blog/2013/09/15/the-most-powerful-lenovo-thinkpad-ever-unveiled-thinkpad-w540-mobile-workstation/
Edited...