A review sample of the Baofeng UV-B5 was delivered today. The radio arrived very late, which means I can’t say much about it yet. However. even without the use of fancy test equipment and without peeking inside, one thing is for sure: this low cost radio has the best receiver and front end in its class. Normally these radios suck at that; we might be in for a pleasant surprise.
More to follow in the next few days.
Ham Radio Blog PD0AC 
I have both UV-5 and UV-6 now for a few weeks, Best from Baofeng Yet! Fast scan speed, excelent TX mod., major improvement over the UV-5R. Everything about these models are an improvement. Well Done Baofeng!!!
How does the UV-B5 compare to the Wouxun KG-UV6D?
Too early for that, sorry. We’re working hard on all the measurements.
Pingback: Baofeng UV-B6 | PA1JIM