I have an R3 on order, but the order was not placed until about 3 hours after it all started. Not likely to be in the first batch or even second batch of arrivals. I waffled about order the camera, liking virtually everything about it except the 24 MP.
Well, get an R5, some of you say. Well, I have had one since they became available. I feel it is the best camera I have owned or used. Its ability to quickly and accurately focus and deliver 45 MP at 12 FPS is near perfect for my needs. Near perfect.
I do not use the full electronic shutter because the slower readout rate has caused problems noticeable in prints. The faster R3 readout should be close to eliminating the problems.
Also, the faster readout speed of the R3 should improve focusing speed and accuracy, even over the R5. Handling appears as if it might be a bit better than with the R5. Again, for me, perhaps not everyone. Also, there is the hope eye control will work well. I still wear glasses and eye control did not work well for me on the EOS 3, my previous favorite camera of all time, but for several reasons I am hopeful it will on the R3.
So I am happy to have placed the order for the R3, but also happy not to be getting one in the early shipments. It will be nice to be able download some files, process them and see how well they stack up to R5 and 5Ds prints. The R3 price seems a bit steep, although I do believe stacked sensors are very expensive to make and yield is likely low compared to Canon's previous sensors, even R5 sensors. I would like to be sure of getting value for my money for my needs with the R3.