And the battle was really strong indeed. There were 2 years, 2012 and 2014 for example where Sistar even won best GG, even against SNSD/2NE1. They were the only ones (besides Brown Eyed Girls I think) that won MAMA that didn't not come from a Big 3 group.
Those 2 years were absolutely huge for Sistar. Both of Sistar releases in 2012 (Loving U) were the 2 biggest idol hits on Gaon in 2012. 2014 they had Touch My Body/I Swear, and Soyou's massive hit Some.
I think if Starship play their cards right and continue to also give them good songs, they are bound to be remembered as the top GGs of their generation just like their seniors
Kara won against SNSD, 2NE1, F(X) and Wonder girls. So Sistar, Kara and Brown eyed girls where like the anti big 3 groups that could go toe to toe with all the groups from the big 3 at the time. (Let's ignore the fact that once upon a time in the early stages of kpop it was SM Vs DSP Vs SidusHq in the start of kpop lol)