Blu-Ray
Mill Creek has released the series on Blu Ray, they're definitely an upgrade from the DVDs.
https://www.amazon.com/Knight-Rider-Complete-David-Hasselhoff/dp/B01HSAIOZW/ref=sr_1_2?ie=UTF8&qid=1480918311&sr=8-2&keywords=knight+rider
http://www.blu-ray.com/movies/Knight-Rider-The-Complete-Series-Blu-ray/159091/