Nothing quite predicts the image quality like the size and quality of the sensor. Ricoh has managed to pack an APS-C sensor (the size found in entry-level DSLRs) into a camera that weighs about half a pound. The advanced compact category is quite crowded, but the Ricoh GR II has a sensor that's even larger then the popular Sony RX100 line.
In front of that big sensor, Ricoh has places a lens with a bright f/2.8 maximum aperture. The lens is fixed at a wide angle though, which means there is no zoom on this camera. The bright aperture will allow for excellent depth of field and solid low-light performance, but the lack of a zoom limits the versatility some.
The shutter speed is a respectable 1/4000, and the processor allows for ISOs as high as 25600. There's a flash built-in, or a hot shoe slot to add one. Wireless flash capability is built in--so Pentax flashes can be triggered without any extra accessories.
Speed-wise, the GR II can capture bursts at 4 fps, but that's for large RAW files as well. Autofocus locks on as quick as .02 seconds, according to the manufacturer.
All of that imaging power is wrapped up in a small magnesium alloy body. Dual control wheels make using manual modes a bit faster. There's a large 3" LCD screen, or a viewfinder can be added through the hot shoe slot, though that will cost extra.
The Ricoh GR II is on the same price range as the Sony RX100 IV, and offers a bigger sensor. The RX100 IV does have an optical zoom, brighter lens and much faster burst, however. The Fujifilm X100T is the closest competitor, with a similar sensor. The X100T has a built-in viewfinder and is slightly faster, but is also listed for $400 more.
Overall, the Ricoh GR II looks to be a solid camera. The fixed lens limits the versatility some, but it fits in closely with the likes of the X100T for a better price. It's a solid option for street photography and enthusiasts, or anyone looking for big resolution in a small, more affordable compact.