Gidget is in HD on Amazon Prime and looks wonderful:
https://www.amazon.com/Gidget-Is-A-Proper-Noun/dp/B07G3MYBXX/

The above version is different than the version for sale which is still SD:
https://www.amazon.com/Dear-Diary-Et-Al/dp/B001M0J1Z2/

Yes, it looks amazing. The colors are so vivid.