It's hard to make MLL delta comparisons going by memory, especially when the numerical change doesn't scale linearly with how the eyes perceive it. Fortunately, we have some numbers to go on... Chad found that the MLL increased by ~1.36x on the 51D8000 with CS engaged. That's an improvement over the ~1.68x reported by CNET on the 50C8000. Chad also made mention of color decoding errors with 1080p/24 material last year. I don't know if this year is any different. 3:2 pulldown works nicely if you want to go that route. No weird gradients or artifacting.
Based on commercials, line bleed is still visible but improved.
As far as floating blacks (luminance?), I never noticed them on the C7000, but I never blocked out the picture to stare at the letterbox bars on that set. From what I've read about with the Panasonics, there can be a delay between the MLL shift and APL, making it very apparent. On my D7000, the effect is subtle because the effect is instantaneous with the APL of the frame (like an inverse ABL). And with a bright, high-APL scene, the iris is less sensitive to detecting the MLL increase.
Given the improved contrast ratio, AG filter, buzz reduction, and styling, the D7000 is a clear improvement from last year and cheaper to boot. The RBF does a superb job with overhead lighting to create the appearance of infinite black. And, honestly, most people watch TV with some light on. Your significant other will thank you.