I am usually a zoom shooter on my travels as you don't miss a shoot and also don't change lenses often. That is why I like the 24-XX mm zooms as it gets you that extra wide esp in Europe. Here is what NG traveler shoots and publishes book/NG with (old blog post but will give you an idea):
What's In the Bag, Lately - Bob Krist
Last vacation I tried RX1 instead of Olympus 12-35mm, but I had Panasonic 7-14 (a few times) and Panasonic 35-100/Oly 45mm, Oly 75-300 (a few times) to compliment it. Before 35-100, I was also carrying Oly 14-150mm like Ray. I was interested in Sony 16-70mm f/4 zoom for nex for the extra reach compared to m43 zooms but it looks like it might not be the sharp lens for the given price, though distortions are optically corrected:
Carl Zeiss Vario-Tessar E 4/16-70 ZA OSS
What's In the Bag, Lately - Bob Krist
Last vacation I tried RX1 instead of Olympus 12-35mm, but I had Panasonic 7-14 (a few times) and Panasonic 35-100/Oly 45mm, Oly 75-300 (a few times) to compliment it. Before 35-100, I was also carrying Oly 14-150mm like Ray. I was interested in Sony 16-70mm f/4 zoom for nex for the extra reach compared to m43 zooms but it looks like it might not be the sharp lens for the given price, though distortions are optically corrected:
Carl Zeiss Vario-Tessar E 4/16-70 ZA OSS