I have just watched the IMAX Dark Knight prologue on Begins bonus, and it's completely off. The vault shots are supposed to be green/cyan, not blue. And the whole thing misses some warmth.
Also, I watched The Dark Knight trailers and TV spots, and though inconsistant between them, they're basically a lot closer to the DCP.
Next thursday, the same theater in Paris will show the trilogy. Since I recently went to see The Dark Knight, I was considering to just go for Batman Begins (probably in 35 mm), but a trilogy marathon does sound appealing.