... sorry, I'm used to comparisons between 1911 and other .45 platforms. That changes things considerably.
The Witness derived from EAA's Tanfoglio line, which are carbon copies of CZ75's. If you are looking for a competition gun in 9mm, have you considered
http://cz-usa.com/products/view/CZ_75_SP01_Shadow/ ?
$800 MSRP, you can find them for less in gun shops, and they are excellent quality; grip size and shape are similar to P-01, but the grip is taller (19 shot magazine, .8" taller) and the slide and barrel are longer.