I think the simple answer here is "you can't". "Dynamic range" isn't a concept with a simple definition, so unless you can get numbers from DxOMark as you've quoted for the NEX-5R and RX100, then you can't compare them. As an example of this, compare DPReview's test of the Sony a6000 where their tests give a dynamic range of 8 2/3 EV for the A6000 (the green line runs from -4 2/3 to +4 on the first graph on the page), but DxOMark quotes 13.1 EV for the same camera. Are either of them "wrong"? No - they're just each measuring dynamic range in their own way. DxOMark don't publish the same kind of technical measurements for mobile phone cameras as they do for standalone camera, so we can't do a sensible comparison.

Getting slightly off-topic here, but there's an obvious question as to "why don't DxOMark publish technical measurements for mobile phone cameras?" I can't find a direct answer to that from DxOMark, but given that it's known that they work purely from RAW data and a significant number of mobile phones don't (as of October 2014) offer a RAW option, they obviously had to find a different methodology for mobile devices. There's also the fact that mobile photographers are (generalizing wildly) less concerned about the technical details of a photo and more about the content when compared with photographers using standalone cameras, so DxOMark are pitching their measurements towards the things that the majority of users care about, which is just business sense.