it was smooth. of course the single core performance will surely win, g2 mini only has the power efficient as compared to th krait 300 of s4 mini.
benchmark wise, they are close to each other. s400 used here is enough for most applications and games.
anyway, gorilla glass used on high end phones are almost zero gap, this is the only disadvantage i saw on g2 mini as midrange phone, unsatisfied.