Very hard to get an 'across the board' comparison, because folks have so many different gear configurations and are at various stages of their diving career (with the broad assumption that experience = comfort in the water). But for what it's worth, here are my stats:
Warm water:
Height/Weight: 5'4" 150lbs
Exposure: 3mm
BCD Style: Steel plate/18 lb wing
Tank: AL80
Accessories: None
Lead: 7lbs (5 lb is on my plate, and another 2 lb on my single tank adapters).
I've grown rather heavy since I was certified four years ago, but I find I'm using almost half the weight I did when I was first certified. I actually did a weight check last week, and found myself hovering perfectly at 10-15 feet with 500 psi in my tank and an empty wing.
Caves:
Height/Weight: 5'4" 150lbs
Exposure: 7mm one-piece
BCD Style: Plate/47 lb wing
Tank: Double steel 100's
Accessories: Three lights, inc. one can light
Lead: None. I have all the ballast I need from those damn tanks! I wouldn't mind switching over to an AL plate, because I truly have all the weight I need. Then again, I'll have to revisit my weighting requirements when I invest in a drysuit, so maybe I should leave well enough alone!