Where did you get the mistaken idea that the 5135 with a grey dial is less then desirable???
I have owned several Pateks and, in determining my next, came across the 5135 with a grey dial. A fantastic looking piece that, for many, is the best looking Patek in the current lineup. The case is gorgeous. Smooth curves, a grey/silver dial that glistens under the sunlight, and a rotor that gently purrs with movement.
The size is perfect for a medium or larger wrist. And I think it is the cat's meow with the brown strap that will be attached to the piece when you purchase it! From blue jeans to a dark suit, this watch is comfortably at home however you dress.
The 5135 combines the best of a retro look with a contemporary piece. I can choose any new Patek and this is the one that adorns my wrist... and the new movement is wonderful as well 
BB
The Goal is Soul