The CXR120 has 6 x HDMI 2.0 inputs and 1 x HDMI 1.4 input (front panel)
The CXR200 has 6 x HDMI 2.0 inputs and 2 x HDMI 1.4 input (1 front , 1 rear)
The CXRs fully support the HDMI 2.0 standard which does include 4K UltraHD at up to 60Hz frame rate, 4:4:4 colour depth, and 21:9 picture aspect ratio.
The HDMI inputs are also all HDCP 2.2 compliant.
The 6 x HDMI 2.0 inputs on both CXRs are all HDCP 2.2 compatible, so long as the source is too. If you connect a HDCP 1.4 device (such as a 752BD), then that input will run HDCP 1.4.
The MHL HDMI inputs (two on CXR200, one on CXR120) are HDMI 1.4 (max 1080p), not HDMI2.0 (4K).
These HDMI 1.4 MHL inputs on both CXRs can also run HDCP 2.2, but devices connected to these inputs (especially MHL devices) may cause the input to work in HDCP 1.4 mode if the source isn’t HDCP 2.2 compatible. This is because the MHL specification only refers to HDCP 1.4, so all MHL sources plugged into the CXR will revert that input down to HDCP 1.4.
So, if the connected source is HDCP 2.2 (including the 1.4 MHL inputs) then all HDMI inputs can run HDCP 2.2.