XC10 features a new 1″ sensor developed by Canon with great potential. It’s Bayer Pattern pixel matrix is pretty good implemented, the resolution in 4K is fine but not razor sharp.

With the Digic DV 5 image processor on board the 4K image can be sharpened in camera, but should not be overused because it intensives grain to and edges getting oversharpened and showing edge-shadows.

Unfortunately the 4K image tends to get a bit to much compressed and moskito-noise is visible if we pixel peep at 1:1 size when using only 205mbit, when choosing 305mbit the image is a bit sharper and there is much less moskito-noise artifacts on edges. Generally when choosing a less contrasty Picture Style setting, very fine details in shadows like very small distant leaves in shadows of trees or bushes tend to compress away a bit.

http://gadgetflux.net/canon-xc10-review/

I see a few things I like, but I don't see anything yet that looks like 4K from this cam.....

London Rental Houses are already saying they see this as the natural successor to the xf305. Same functionality, higher resolution.

http://www.focus-numerique.com/test-2472/camescope-canon-xc10-sur-le-terrain-2.html

Canon today announces that the XC10 video camera has been independently tested in accordance with European Broadcast Union (EBU) standards for HD content acquisition¹. The tests found that the large 1.0 inch Canon CMOS sensor coupled with Canon’s DIGIC DV5 image processor provides ‘little or no aliasing’ concluding ‘ its performance meets (HD) Tier 1, and it easily meets (HD) Tier 2L’² allowing its use in a wide array of broadcast and cinematography applications.

https://tech.ebu.ch/docs/tech/tech3335_s17.pdf

And sinking :)

Because of its small sensor and low light performance, the XC10 will not cut it for indie filmmakers looking for an all-in-one digital movie camera, shallow depth of field, or a single camera production. After using it for a few weeks, I think the XC10 would best fit into two categories. First, although 4K isn’t for casual shooters, I can see the XC10 performing well as a lightweight B-camera, or crash cam, for a 4K C300 Mark II shoot, especially in run-and-gun situations where mobility is a factor. Shooting with Canon Log will allow you to seamlessly cut XC10 footage with any of the Cinema EOS products.

http://www.dpreview.com/reviews/crossing-the-bridge-canon-xc10-review