I love my RX100 (I have the original) and would shell out for the newer model not for the wifi but for the electronic viewfinder. The screen isn't bright enough so in very bright light I am basically guessing about how the shot will turn out.
I am very happy w/the low light performance. I assume since you have a DSLR already you know reasonably well how to take advantage of the ISO, Shutter Priority, and Aperture Priority to get the shot you want. If not, you should learn that before buying a new camera!
I love how portable the camera is. I take it way more places than I would ever take a DSLR. It doesn't fit in my (small, women's) pants pockets, but if fits great in most of my jacket pockets & doesn't take up much space in my purse. I'm also super happy with the battery life. HDR kills it (as you would expect) but otherwise it stays charged for months with minimal use, so it's always ready when I want to take a quick shot, and will last through almost a whole week of vacation shooting. I did buy a 2nd battery for it for about $20 and I use that when we go on vacation, but I'm not convinced it was really necessary.
Finally, I got mine from Amazon Warehouse deals. It was "used". Someone had ordered it, taken the charger, and returned it. Big deal, I just chatted w/Amazon & they sent me a replacement charger. There is also a tiny scratch on the display, but I saved about $75 for that, so it was worth it. Highly recommend this source for buying any high end electronics if you can't find them on Ebay.