So Guy started a travel the world with Sony kit thread and I thought it was a great idea, so I'm copying it here. Here is what Guy posted over in Sony:
Nikon D810 hands down over my A7r -- it just fits my hands like a glove, the controls are right where I know they should be, and the images flow directly through the outstanding viewfinder to my brain. Not to mention incredible AF, metering, great higher ISO when needed, 2-card storage capability and outstanding battery life.
Lenses are a bit tougher. When I travel, I usually limit myself to 3, but for a world-class trip, I may bump to 4. They would be first and foremost, the 50 ART and my Nikon 28 ASPH AF-D. And in all honesty, I could prolly just quit right here, but wouldn't for a world-class trip. Next would prolly be my Nikon 17-35/2.8 zoom simply for the wide end and versatility. Final would be a Nikon 70-200/4 to cover all longer focals and versatility -- I don't own it yet, but will before my next world-class excursion ( ). Note that I'm not opposed to leaving the long zoom in my hotel room when I know I won't be using them and plan on moving light and fast.
4 lenses and body will cram into my Domke J803 for the plane ride -- I have modified a Domke 4-lens insert for it -- and is a perfect working bag since the camera and one lens is always out. In the pockets I have extra battery and cards of course, lens cloth and small body brush, travel guidebook and local map fits in the rear slide pocket -- and that's about all I need for a day around any village.
A note on the yet to be released Sigma ART 24. If it is as good as the 50 and 35, I will own one. However, while 24 is a focal I use a *lot* for landscape, I don't use it often while traveling, finding it either a tad too wide or a tad too long, hence my gut tells me I'd be happier with the extra width and versatility of the 17-35 zoom.