Thanks for your impressions. While I won't argue with you on overall wildlife shooting, I do think overall, as a whole, the 1DX still offers more. For well-lit wildlife? Maybe not. But considering all "real world" situations, the 1DX is still better. I'm not sure why you say "us in the real world" because my real world IS low-lit venues with high action, where the 5D3 can't cut it. Also, if you shoot higher ISO, the 1DX files can be processed, pushed, and pulled far more than any 5D3 file. Despite having less MP's, the highlights and shadows have more detail. I will also agree that for wildlife, 12 fps probably isn't needed, although I know gary samples has used that feature quite a bit for his work. You're right, the shutter is LOUD.
Battery life? Are you kidding? I've shot 4 basketball games in high burst mode on one battery
For the 5D3, I love the 22 mp, and I also love silent shutter like yourself. I use it extensively for tennis and golf. Either way, if the 1DX doesn't offer you anything additional over the 5D3, then use the 5D3. Afterall, I have one and am very happy with it.
In fact, if the 1DX hadn't come out, I'd probably be shooting everything with a 1D4/5D3 combo. Good luck and I look forward to seeing your wildlife photography!
I hope you take my comments/arguments as friendly and for fun
. Afterall, you've been doing this for 30 years!