You have gotten some great advice here.
imho, if hand-holding is important to you, you have to go to a good dealer or a big convention (NAB?) and just try every camera you can lay your hands on. It’s a very personal thing, and what suits one person may not, literally, fit you. By and large, the newer cameras are not very adjustable to accommodate a given operator’s preferences and body-type variations. This is quite puzzling to me, because this problem was clearly solved 20-30 years ago, by the designers of the Betacam and the Aaton.
I have tried to ease hand-holding the EX1R, but without much success. It’s a shame, because the beauty of the camera is that you can carry it so easily, maneuver it in tight spaces, and still get incredible images. Adding a shoulder brace changes the highly portable character of the camera. There are several shoulder braces; the one I tried didn’t work that well. Using a viewfinder magnifier helps; it’s “close” to being right for me, but not perfect. If you are accustomed to the old Betacams (with their extensible (word?) viewfinders and built-in shoulder pads, with the battery nicely placed for balance aft of the shoulder) … well, you won’t be as happy about hand-holding an EX1/R all day.
My solution was to get a monopod with a quick-release. That way, I can get rock-solid shots, even at tele, move around freely (without tripping up people with tripod legs), and pop the camera off when I need to get a low angle, high angle, or do a move.
I added a very solid metal bottom plate and rods to my EX1R, and that helps me a lot. I can grip the rails or the plate, and it’s all quite solid. But it was a task to get everything lined up correctly.
I had to use a client’s JVC camera that looks just like a half-size Betacam, and found it quite nice, except that the viewfinder was rather low-res. Maybe the newer JVC cameras have a better viewfinder.
Good luck and please report back what you discover.
Bob C