Upload & Sell: Off
There's nothing to repent for. The 7D was a fantastic camera, and as a challenge, if I knew how to strip EXIF data, I would pull photos taken from events I shot at 6400 and say tell me which was my 1DIII and which was the 7D.
I used both side by side, and while parts were lacking on one, parts would be lacking on the other. To me, they were both a wash.
jcolwell hit the nail on the head when he said "for me." He is absolutely right. There's a guy on here (is it imagemaster?) that has posted some seriously legit photographs taken at ISO 6400+ on the 7D and they look absolutely stunning. Others, like me, don't do much NR to the photos. Maybe 10-15 clicks on the luminance slider. To me the 7D was an effin' leap forward from the 40D/30D combo I was using at the time.
To be fair, the 1DIII, when I bought a pre-owned one, was a leap into the "big leagues" in terms of "pro features." I hate to call them that, but for lack of a better word, I will. I guess one could liken it to a base model Honda Accord vs a top end Acura TL. Sure, at the end of the day, you've basically got 2 Honda Accord's (I understand that's not exactly the same comparison, but you get the drift) but the "fancy features" really made it.
I haven't screwed with a 1DX yet, as I KNOW I want one, and I KNOW I will do something stupid to charge it. If I could trade both of my 1DIV's for one, I would consider it, but then I wouldn't have a "sports back up", and no, in my mind, the 5D3 isn't a sports back up (I only mention it because I own one).
With all of that said, you owe nobody a damn apology nor do you need to repent for anything. The tool you used, worked for you. You've got a better tool, and it works better. Hell, I have photos at the highest ISO from my 5D3, and I think to myself "holy hell this is fantastic."