I had a chance to compare the new Sony master series TVs at CEDIA and both of the LED and OLED models looked fantastic. The LED was naturally brighter, but the OLED had better off-angle PQ and darker blacks.
In the end, it's really all about your room. If you have tons of uncontrolled light you might be better off with the LED. OTOH, if you have folks seated off to the side, and want better low-end contrast, then the OLED might be a better match.