Sounds like my RS56 is the same as Kris'. I've been staring at the picture for ~25 hours now with all sorts of content and while I haven't taken any calibration measurements yet I'd be surprised if there was much to change. Greyscale looks good across the range, gamut seems fine (no or very little oversaturation of primaries in standard colour profile), and gamma at 2.2 looks decent. May have a little bit of gamma work (some boosting) to do in the low end but it's minor and I'm waiting until some work is done to the adjacent walls as even minor light bounce can wash out the low end easily..
I'm running my RS56 at most of the settings Kris mentions above (USER1, 6500K, Normal gamma [which seems to be 2.2], -10 iris, MPC set to FILM with all 3 sliders set to zero, all NR off, CMD off, everything else off).
It's letting me enjoy watching it without thinking all the time "ugh - I need to get this thing calibrated". (I'm in need of a new meter or have my existing one recal'ed)
All machines will be different of course so this is no guarantee that someone else's will look good as is, but I'm very surprised at how mine looks out of the box.