"Planet of the Dead" was the first episode of New Who made in HD.
If you're in a PAL country then the 2023 UK boxset of the 9th & 10th doctor era is the best way to get them on Bluray (and the first Region B release at the correct frame rate).
The main advantage of the bluray over the DVDs is the use of the H264 codec and industrial upscaling (thankfully not AI upscaling!) used on the boxset. Effectively it's as close as we will get to the master tapes for those episodes. So whilst you won't see a massive step up in picture quality between the DVDs and blurays for the 2005-2008 episodes, personally I thought it was worthwhile doing (plus it's convenient having them all in the one boxset).