HTC and Blackberry are already looking at the tail lights, Sony is next
In Q2 2013 Nokia increased it's sales to 7.4M going from 11th to 9th place in the Smartphone marketshare, surpassing Blackberry and HTC.
Next on the list is Sony with 9.6M, but after that the way into 3rd place is not long . The 3rd place is held by LG with 12.1M (only 2.5M separating the 8th place from 3rd)
If the 520 keeps selling a lot Nokia will come close to Sony, or even surpassing it.
Next quarter GDR3 brings support for quadcores, 1080p displays and maybe a notification center along with other improvements ; with devices with them ready to go as soon GDR3 is released Nokia will possibly jump to the middle of the table.