Pro lab print shootout
Here's more info: http://www.smugmug.com/photos/pro-print-labs-compared/
At first glance, testers couldn't decide between Mpix, upper right, and Bay, lower right as best. The Bay shot was slightly redder in the cheek, which most testers didn't like. But those who noticed the foliage color behind the girl all chose Bay.
A second Mpix version, upper left, struck most people as too blue. Same for whcc, but not to the same degree. Some people liked the somewhat pink color of the ProDPI, and some disliked it more than the blue of Mpix.