I am 50 clicks into my D810 and I have found 3 lubricant spots on the sensor as well as 15-20 dust spots. I don't think this is excessive but I wish it had been pristine....
Anyone else?
It's just all part of owning a DSLR it seems. My worst offender was my old D7000, but I've got a few on the D810 after not a lot of use, but they don't bother me, they'll be cleaned off eventually.