On my recent trip to Italy, I brought my GF1 w 14-45 kit lens. More than sufficient for casual touristy snap shots with better IQ than pns. It is much lighter, and easier to take out or keep as compared to DSLR.. it wont attract unwanted attention as it looks like a pns camera. you can also pass it to tour guide, driver, waiter to take group/couple shots without worrying they dont know how to use it.
One drawback is that it might be a bit slow for internal lowlight shots of churches and buildling. But so far I am happy with the pictures it has produced. Sadly, my D700 has been sitting in the dry cabi since I bought the GF1 in 2010. :cry:
Italy was the first trip I took when I bought the D700. The low light shots in the churches are important, makes a big difference, especially the f/2.8. The ISO could only go to 1600 with D700. D3s is much better, I shot at 12800 and had no or little noise
As the sun sets, using the D700, first you slowly reduce the f to 2.8, then you start to increase the ISO, you could feel the importance of low light sensor working, especially in churches when they switch off the lights