There are some fantastic HD vision mixers these days and the Roland V-8HD is no exception. At £1,600 this is a snip for an 8 channel HDMI vision mixer with preview built in.
It seems to me HD is at the final gate before 4K and 8K take over.
Years ago SD vision mixers were all the rage and HD was only an expensive pipe dream.
All HDMI workflow
Five-layer effects and keying engine
Up to 1080p50 Resolution Support
Multi-Format, HDCP Support
8-Bit, 4:2:2 Video Processing
Built-in multi-viewer preview monitor
Aux output for a different video feed
Technology-assisted automatic video switching
18-channel digital audio mixer with effects
Start & Stop Atomos recorders
Free iPad remote control app available
Ultra-mobile, lightweight, and efficient