The Exp 39 will be an interesting watch to get in hand..
The Sub is a measured 39mm watch (Sub Date is 40); so the Exp should wear like and have the same presence on the wrist as the Sub, Daytona, or Exp II.. Doing some 'screen measureing", it seems that it will have the larger Milgauss size dial and crystal though.
It will be nice to get some real comparisons.............