I went to the D800 and spent 12 grand switching, and I never looked back. Crop modes, clean shadows and highlights and DR were the main attractions.
Images from my D800 look like drum scans from MF/LF film, and that's the first time I'd seen a digital camera hit that goal.
I'll let Neuro defend himself, he's usually pretty good at that, but I have a few comments.
I don't think anyone disputes that the D800 sensor is better at base ISO. That advantage disappears at the higher ISOs. If you only need base ISO then the D800 might help you.
Your entire post is from personal experience: religious wars have been fought over personal experience, with each side being certain it was right. As the saying goes "a pile of anecdotes
do not constitute data
." Personal experiences may make you feel good about your purchase, but do not provide objective evidence.
How many photos have you missed due to poor focus?
Depending on time of day, I believe my 60D could have made those photos you linked. (but that's just opinion, not proven fact)
I'm glad you're happy with your Nikon kit: in the end, that's all that matters. I doesn't prove anything objectively.
Keep making images you enjoy.