Well, I made a made dash to pick up my 5271. Set it up with PS3 and DTV (all SD though). I didn't have a chance to check out the blurriness of tennis/footballs yet, but it's high priority. I do have a couple of flashlights in the top corners. Noticeable in Letterbox movie, but not sure I want to return it just for these. Glare doesn't seem to be a worry afterall. TV is a piece of art...just fun to look at.
I bought Happy Feet on BR (I know, I know but I wanted get something for my wife). So I did some minor tweaks, put the TV in movie mode. Played around with the backlight and contrast a little. This was my first BR, so I knew it would look good. Some of the pictures looked absolutely 3D. Snow and glaciers looked amazingly detailed. The depth of color was really cool. There are a couple of dark scenes, and even with the lights on in the room, the black feathers of the penguins coats still looked deep in the dark scenes. Can't testify that this is just the Sammy or just the BR. Sure seemed like the 71 was making BR all the better though.
Many might not be familar with Happy Feet, but the opening of the movie has some big flying over landscape IMAX like scenes. This might be a bad thing to some, and a testament to the quality of the TV, but I got downright dizzy. I'm about 7 feet from the TV, and I had to close my eyes at one point. Kind of made me second guess the size sadly. I turned off the automotion and watched the opening again. Didn't look as 3D, but I also felt less dizzy. I'm going to have to play around with this on other movies and especially games. Can't have people puking on my new TV. I might have to readjust where I put the TV, but thankfully that's an option. What's the consensus here: 7' from a 46 or 9' from a 52? Assuming that 7' from a 52 makes makes me spew.
SD looked as good as SD can. Don't plan on using this TV for that much SD viewing. Mainly games and BR and HD cable.
So far, I would be extremely surprised if my eyes could discern any difference between the XBR4 and the 71. Maybe somethings would look better on one, and not the other. Nervous about the blurring of sports that people are mentioning, but it seems like this is all happening over DTV boxes. Those things do all sorts of compression and processing, so they could be the culprit. I get macroblocking on my SA8300 watching episodes of Planet Earth I recorded or watching ESPNHD.
On an aside, I'm going to play the BR on my older LCD to see if it is still jaw-dropping.