Self explanatory images.
Shot at 2000, 2500 and 3200 - pushed two stops at commercial lab. Virtually indistinguishable between the three ISOs. Now that's latitude with a nice attitude!
Haven't tested between 800 and 1600 yet, but I think it would be similar (except for even less grain) with a one stop push.
BTW, that D2 is not in the darkroom cause it's gonna get ready for the eBay soon.