The LX7 is quite pocketable, and is a bit smaller than a m 4/3 with a "fast" lens on it. It mostly depends on how small your pockets are, I suppose. If you want to talk ISO, the Pentax with it's 1.5x crop sensor, can do ISO 25,600, with noise that can be very workable in post, with decent color. It can fit in a large coat pocket. If you're female or have really small or tight pockets, then I would just suggest a small smartphone or something (smaller than a Samsung Galaxy, etc.).
The P7000 was small enough to be pocketable, but I usually just hung it around my neck. It's about half the size and weight of the G1x, and about 75% of the size and weight of the G12. The P7100 was the "updated" version, but it could only go up to ISO 6400 (dimensions and weight about the same as the P7000). The P7000 could do ISO 12,800, but at a very reduced resolution, and only in jpeg mode. That said...considering the sensor's size, those images were certainly usable for web-sized format (the color wasn't great, though). The P7700, looks like it might be the same size as the G1x. Those two are niche cameras, in my opinion, meant to be worn around the neck.
I mean, the ultimate compact camera for low light street photography, would be a Leica with a noctilux lens. Hardly pocketable, but smaller and lighter than a DSLR. Of course, it would be cheaper to just hire several top class photographers and let them do the work for you.