Tiepolo,
I'm far from the authority on the subject matter, but I will help however I can.
The "normal" G15 has an out-of-the-box contrast of about 250:1-300:1. We know that this can be improved after market with a post-sale calibration to about 500:1 or so.
The G150HT has an out-of-the-box of a really good calibrated G15, and in fact, it could be thought of as a premier, heavily-modified G15 in a G20 enclosure.
The SC2000, on the other hand, boasts a contrast in the four-digit range! At least 1000:1. On the SC5000, it was very noticable. The black level was outstanding, and the picture had more punch than a Tyson title match.
This doesn't happen with simple software tweaks and end-user adjustments. This only happens when the best D-ILA chips are hand-picked for inclusion in the specially designated "SC" models.
Unfortunately, the SC5000 was still quite pricey at it's debut with a $70K list price. I don't know what the price is on the SC2000.