RX100 JPEG Image Quality >>>> Most DSLR's??

I am looking to purchase the RX100 has my 2nd camera or "pocket camera" to take with me on trips.

I noticed that in DPreview's review of the RX100, when you go to the CONCLUSION category and look at the ratings meter, it has the RX100 jpeg's image quality superior to most APS-C DSLR's, and even it's High ISO performance rates better than some DSLR's.

How is this possible given that this camera has a much smaller sensor?