You should hold out before you replace the DVDs. Only season 1 is on UHD, but the rest are coming. Apparently the upconversion, HDR grade and wide color gamut is spectacular, and season 2 and up used better cameras so they expect even better results. And they ported over the Atmos mix from the Blu-ray re-releases, which were already monsters. Essentially they are cinema quality experiences. That's what I'm waiting for.