Probably not helping anything here but in my loop (PA120.3, 2x MCW60, EX58-EXTERME NB block, LUNA-type prototype, MCP655@1, 3/8" Primoflex, 3/8 perfect seals, BP compressions & 1/2" high flows) the "Luna" style block (can't talk about it) outperforms the APOGEE GTZ on my 4GHz Core i7 920 by a degree or two depending on the core under load. Ambients were somewhat controlled, but not entirely, but I'm confident enough to call them competitive with each other within margin of error.

Again a low flow loop though.

The fact that you can't get any high flow dedicated CPU loop testing done might indicate how many people actually do that (in the grand scheme of things... Not just here at XS).