I have both of those basses but my ABII is not semi-hollow. I don't know if I could be much help to you, though. The ABII has a modern sound but with a woody tone. It also has a really solid earth-shaking bottom end. It's two pickups can give you a Fender-ish tone - both P Bass and Jazz bass. The Super PJ has a more conventional fundamental tone but can be really big too with the built in active electronics. I love to play the P pickup in passive mode. It has that classic P-Bass "woof" sound but more defined. It reminds me of a big bear. The J in active mode can give the solid Jeff Berlin sound - the ABII can do that tone, too. It's hard to cover it all because they are both basses are very versatile. The only way describe the difference is to say what they don't have. The Super J does not have the solid natural bottom end of an ABII but it is also not thinner sounding than any other good conventional bass. And at the moment it doesn't have a low B string. The AB can approximate the classic Fender sounds but the Super PJ nails them and both basses are clearer and more defined than a Fender. The ABII doesn't have the same feel as the Super J. I love Fender style necks (I still like to play my 5-string Fender Jazz) but for some strange reason I am more comfortable on the 5-string AB neck than I am on the Super J but that is changing gradually as I play the Super J more often. You will know when you try them... Or maybe not. I have both and I can honestly tell you that I don't know which one I like more. Even at gun-point I could not say.

wow, tough question. i find my p/j and abII-5 semi hollow are quite different animals. i think ... for me, it's the piano like clarity and depth that the abII-5 semi hollow provides that is most strikingly different from my p/j. i love them both though. if i could only have one of them, i'd probably take my p/j cause it does everything well, but then i'm still more comfortable on the shorter scale, although that seems to be changing slowly...