I have been away a while. I hope to be active here again.

I am currently selling my fully kitted out Sony PMW-EX3 to get some value back out of it and get something to start 4K. In my photo gear I am fully set up for EOS so I am considering a 90D as my first dip into 4K.

Any thoughts on this camera and my move from the EX3 would be appreciated.

Depending on what you're doing it's a mixed bag. I have cameras that have 4k and I only use it when I really need it because it creates big files that take longer to edit and export. The dslr/mirror cameras can be a pain because all the feature you take for granted on a camcorder are missing. built in ND, long zoom range servo zoom, long batter life, physical controls, etc