In
The Complete Book of Autopistols Buyer's Guide - 1992", Gene Gangarosa did a "German Shootout" between the P88 and the P7M13. Part of the reason I bought a P88 before I bought a P7M13 was due to this article. I've owned both, I currently only have a P7M13, having sold the P88.
Specs P7M13/P88:
Overall Length: 6.7"/7.4"
Barrel Length: 4.13"/4.0"
Weight unloaded: 30oz/31.5oz
Capacity: 13/15
His accuracy tests at 25' gave the overall nod to the P88 with it shooting all 5 shot groups in under 2" except for Winchester STHP. At 50', his one ammo test of Winchester 115gr FMJ yielded almost identical groups of 4.2/4.3" respectively for the P7M13/P88.
He made the comment that the P88's grip was bulky, but not as bad as the P7M13.
Now my comments:
I couldn't shoot the P88 NEARLY as well as any of my P7s including the P7M13. I find the P7M13 grip VERY comfortable and I don't have large hands. I can shoot my P7M13 very accurately. The P88 I had had a terrible trigger, and I wasn't willing to invest shooting it 500 rounds to smooth it out. The P7M13 (as do all of my P7s) had a crisp trigger out of the box and is just marvelous.
I thought the P88s grip was wider and fatter than the P7M13 myself. And it is a much bigger feeling gun.
Just my .02 worth
James