In certain iconic cities like New York or Paris, I love to bring my M3 or IIIf. It just feels right. However, if I'm traveling with family, it is usually the D700 with the incredible 28/1.4 AFD.
I'm currently on a business trip now in Tokyo, and I brought my brand new X Pro 1 with the 18/2. And since Tokyo is one of those iconic cities for me, I cannot help but to also bring my M3 and the ZM 28/2.8 (framing is mostly guesswork, but oh what fun I'm having).
I will have a free weekend in Tokyo, and will see how the XP1 handles. Planning to photograph the cherry blossoms, the Tsukiji fish market, and random street stuff.