Received our 40" Z5100 one week ago. Extremely happy with the results.
Was able to replace a 32" Sharp with side speakers and gain 8" viewing for my wife's primary viewing in the Master Bedroom Armoire and while I was torn between it and the B750 it's a damn good thing I went with the Sony as I found the Samsung would not have fit the space.
To my surprise when I set everything up was how reflective the Sony was while off - not full matte like my Sharps but that has no impact when the TV is turned on at all. Damn the TV is black and semi-reflective Off but a beauty when displaying.
No gaming is done on this TV and so I won't report on anything in that regards and I won't assist with calibrations since my viewing preference is a vivid panel and I don't give a crap if anyone else doesn't agree with my preference.
I decided on this panel after studying panels for the past 6 months and finally viewing the XBR9 and the Z5100 next to Samsung B750/B650 panels. As great as the Samsungs were I was unable to get that peering into PQ DEPTH that I experienced on the new Sony panels - plus I feared the wife may bitch about reflections on the Samsungs after having none for 4.5 yrs on the Sharp. I was repeatedly impressed with this immersiveness on these two new Sony panels as I am in my Home.
I popped in Mamma Mia Blu-Ray and it was fantastic - the Mediterranean Sea color and clarity was eye popping and I turned on AMP and when you haven't experienced it before it's sort of strange to have that Live Camera view and soap opera look - I prefer the theater look but it's nice to play with.
The blacks on this are wonderful trumping the 4.5 yr old it replaced easily.
I spent hours going from the bedroom to my main 57" 3.5 year old Sharp and I used Food Network HD to cross compare since they constantly zoom into the cooking experience and it's easy to see PQ details on that channel. Again my in-store HD Viewing with 3D depth peering into of the Sony trumped my 3.5 yr Technology on my Sharp easily. The friggin clarity on HD on these cook-off's was simply amazing on the Sony and it tells me Sony may have a kick ass 65" when it debuts with BE3 on the W5100. My Sharp had a flatter smoother look - still looked great and the size delivers alot of WoW but the details on the Z5100 was stunning. The Z5100 and XBR9 are the first LCD's I've seen that could match or exceed the PQ details of the SXRD with HD.
Also, I carefully watched for flashlighting and clouds and saw ZERO - simply BLACK - BLACK - BLACK!
The only negative I can report is Turdvision SD - it is what it is - a TURD!
I'm used to viewing HD 90+% of the time and so I'll always tolerate it for my channels that have not transitioned yet but I don't buy my TV's for SD - after all some SD channels can look quite good while others are crapola no matter the panel especially after growing accustomed to HD at six times the PQ.
The irony is that I'll rarely view this TV regularly as my wife and I have very different tastes and I have a sleep disorder where I only view the Sony occasionally after setting it up but it gave me a yardstick to make a move to a 65" > in the future with it's PQ Depth, Details, and Black Levels and hopefully I can provide her this larger panel with First Rate PQ for 8+ years and she's quite happy and takes away the guilt when I jump to a 65" as she'll have the Z5100 for regular viewing and then the BIG HT 65" or my 57" for HT immersion as size does have it's benefits to get HT immersion with Blu-Rays.
IMO Ten/Ten, BE3, 240Hz, and the 100K:1 CR and the maturity of Sony Bravia Series is now returning rewards in the "Z5100" and XBR9. Enjoy!
ALSO --- Most importantly with the achilles Heal of LCD --- I see no Friggin HAZE!!! The Samsungs are still outstanding IMO also but if you cannot handle the reflective nature and ambient lighting issues a viewing room may interfere with PQ these Sony panels trump the Samsungs IMO and with a little patience the prices should drop also.