Here's a review that has information on the viewing angle that is a bit more useful than typical specs:

http://hdguru.com/sony-xel-1-finally-a-critical-review/242/

This is quoted verbatim from the review - it goes on for another paragraph on these lines:
Viewed straight on, the XEL-1 produced an outstanding contrast ratio. However, moving off axis (either vertically or horizontally) I was quite surprised to notice a significant fall off in brightness. This called for a series of 45 degree off-axis brightness measurements using a Photo Research PR 650 spectroradiometer (used for all subsequent measurements as well). Taking these readings became a challenge as I discovered the XEL-1 automatically dims as you watch it (more on the dimming phenomenon later).


Sony claims 178 degrees, but this is just a marketing number, of course, and does not specify horizontal versus vertical:
http://www.sonystyle.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10551&storeId=10151&langId=-1&productId=8198552921665327724

Here's a CNET review which says viewing off angle is very good:
http://reviews.cnet.com/oled/sony-xel-1-oled/4505-13948_7-32815284.html


My advice is to judge more from people's experiences than what the marketing number may be - while not meaningless, the claims of huge viewing angles are a measurement of how far you can go off axis while maintaining a certain level of contrast, which happens to be useless in many cases - TN based LCD panels will have "160 degree" viewing angles on the spec sheet, but for optimal usage because color shifting is bad, it's more like 30-50 degrees.

Going by that, it looks like the OLED TV isn't any worse than any LCDs, but it might not meet your standards if you want something that looks perfect from highly oblique angles.

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