I coul give you my sense of an index:
Acoustic expansive - "Michael Hedges"type tone
Thin toney loud kick ass blues - Albert King
Thin fat hollow blues -SRV
Fat thin hollow loud rock - Frank Zappa
Thin/fat expansive and impossible to create - Eric Johnson
I give up, there are so many greats out there. And I would put money on the fact they could pick up my guitar and burn like hell. I am slightly worried in fact that blokes my age are ruining guitar: they have a few bob now they are older and can afford to buy all the best gear and turn into tone snobs.
Musicality first I reckon. I wish I had it. But fiddling with trim pots is no match for good ears.