All of the Big Bang Theory seasons on blu-ray are pretty much the same release spec wise. Seasons 5, 6 and 7 actually had combo packs with DVD, Blu-ray and Ultraviolet all in one package. Those are pretty hard to find, and you'll probably have to look on an auction site. Season 8 on appears to be packaged with Digital HD copies, which is great. I own almost every season now, and they all look great on the shelf next to each other. The blu-rays are quality transfers. If you're a fan of the show, these are definitely worth owning.