A:Answer You absolutely would have a better viewing experience, especially for your Bluray viewing. The images are much like looking through a very clean window. I went from a 55" to the 70" and it makes a big difference in viewing experience. Just the size of the TV, for one. Everything is larger, easier to see. There should also be some improvement in the picture itself. The M series upconverts to "near 4K". It does make a difference to my eyes. Be sure to connect your Dish box to HDMI 1 thru 4 to get the best upconversion experience. As to viewing from the 90 degree couch - I just checked (I have a similar setup) and it still looks great! If you're buying this for 4K, be aware that there is very little of it available. Dish transmits at no more than 1080i - I don't know what their plans are to upgrade to 4K transmissions. You best bet for 4K content is currently YouTube. That being said, I will also say that I'm glad I didn't wait. I smile every time I watch a movie or a football game. And I will be ready for 4K DVDs and 4K transmissions from Directv in the relatively near future. :-)