I've done some testing, and the Xbox One does not actually crush blacks. Both limited and full range RGB output as they should do.
HD LCD TVs have something called 'HDMI Black Level' if you're playing through HDMI and in 720p or higher (1080p) - it is disabled below 720p.
Typically, there are two settings for HDMI Black Level; Normal and Low. Normal is the equivalent of Full Range RGB, and Low is the equivalent of Limited RGB.
In short: If Xbox One is set to Full RGB, set HDMI Black Level on your TV to Normal.
If Xbox One is set to Limited RGB, set HDMI Black Level on your TV to Low.
If you mix either of the settings (Xbox One set to Full, TV set to Low, or Xbox One set to Limited, TV set to Normal) you will see crushed blacks.
If your TV does not support Full Range RGB, and you set your Xbox One to output as such, again, you will see crushed blacks.
Killer Instict is crushed by design.
As for the sharpening, I believe the brunt of what we've seen up to now, at least where jaggies are concerned, is again, down to calibration.
Killer Instinct is a crushed, jaggy game, this is undeniable. However, I, personally have only been able to replicate the severity of jaggies in the OP by enabling sharpening on my TV and setting it extremely high.
As it stands, with sharpening disabled (I've tested on multiple TVs) jaggies are reminiscent of the Xbox 360 - differing between games but mostly insignificant, except in a few cases.
Assassins Creed looks very smooth to me.
NFS:Rivals looks very smooth to me.
BF4 (multiplayer) has jaggies reminiscent of Xbox 360. No more, no less. No ultra smooth magic sauce, but not as jaggy as KI.
And to add, one more thing: sometime during the second half of the 360s cycle, it received an update that allowed display discovery to calibrate your TV automatically, even sharpness. So, if you chose 'optimal' under display settings, in the case of a Samaung TV for example, the image mode would have changed to 'Entertainment' and a lot of settings, including sharpness would have been locked (greyed) out.
The Xbox One does not appear to have this feature. The Xbox One equivalent seems only to set resolution output to match your TV's native one.
So basically, you need to calibrate your shit, people.