>>4297163The big upgrade with the V over the IV is the phase detect AF, other than that you get 24fps instead of 16fps If you're going to be shooting quickly moving subjects then it could be worth it. That said I have the IV and even with just 25 contrast detect points it's still decently quick and will track objects.
>>4297213Go for the RX100. It's one of the few decent cameras that are actually literally pocketable without wearing a trenchcoat. To get the same versatility on a mirrorless body you're going to be looking at about double the weight just for the lens, probably the same for the body, and like 4 or 5 times the thickness. You may even need to go with multiple lenses, or extension tubes with a standard zoom. I think this photo may have been taken using an old Canon close up filter (magfilter attachment) but it doesn't make a huge difference, the RX100 will focus pretty close on its own.
