too expensive, too little genuine 4K material

Have the hard drive here via Amazon Marketplace bought used, thereby saving a lot of money, but I find the product too expensive. Only some of the feature films is in German synchronization. Although I do not yet have seen everything now, so I think that documentaries are in real 4K, but the movies quasi only as Upscale. Upscaling can both my TV, as well as my BD player. Did Star Trek (2009) from the hard disk in 4K on my TV (Samsung UE78HU8590) and Blu Ray (Full HD + upscaling) (Player: Sony BDPS790 4K) compared. Despite new glasses is no difference for me can be seen. The documentaries, however, blown away by her picture simply. World class!
Conclusion: Who is conveniently located on the hard drive will be at least partially impressed. A lot of money would be better not to be issued.