There's been some controversy about the HD video quality on the Apple TV, which we've covered before. Now that Take Two has dropped, iLounge has done the legwork to put together an excellent visual comparison. They compared four versions of Live Free and Die Hard: Blu-ray, Apple TV HD, Cable HD, and DVD.
The results were quite good for the Apple TV; while Blu-ray was the clear and expected winner, the Apple TV version outpaced the Cable HD version on several of the tests, particularly those testing compression artifacts. The upshot: "Because of its cleaner motion and audio, we felt that the Apple experience was better in both overall audio and video quality than the HD cable experience, and for most users, superior to renting a standard DVD as well." Check out their full article for many more comparison shots.