Which screen is better W710 or W510

[chazz]

Since W710 is going to be fazed out soon..
I am wondering which screen is better in terms of contrast, brightness, sharpness and viewing angle?..the W510's FHD or the W710 UXGA LED(I beleive is 400 nit)?
the price on the W710DS looks decent compare to when it first came out, and the W510's FHD screen has gotten pretty high marks..
Does the "HD" make any difference in term of viewing movies?
Does anyone has actual experience on these two machines side by side together?
Thanks very much!