I was concerned about parity between 4cell and LiPo last year... and even earlier this year. But I think seeing how keen people are to get away from 4 cell, 1S specific ESC's and programs, and the overall advantages of a light low impact 1/12th.... Few people are going to run 4 cell this fall/winter.
So I think the parity concern is less now than it was last year or earlier this year since the chances of someone running 4 cell competitively are pretty low. Newbies may run 4 cell just cause they have the gear, and really who cares about parity with new drivers, they are just getting the hang of it.
But... from our testing:
a 10.5T/1S = 13.5T/4Cell = 19T/4Cell. Top speed is higher on the 13.5 4 cell, but cornering is WAY better on the 1S 10.5T chassis. On a real open and sweeping course the 13.5 may walk past the 10.5T, but in any technical cornering the 1S chassis is far superior.