I've driven s2k for many years (shared my brothers s2k). Ever since I got the Z, s2k became really slow. That being said, the 2 cars are different breed. S2k has an amazing feel to it. You can hit those corners with ease while maintaining the line and control. It's very forgiving.
On the flip side, Z can punish you. It doesn't take kindly to mistakes. However, it's fast. Faster than the s2k. Although it lacks the low center gravity feeling, like the s2k, it still gets the job done. It can pull 1+ G on skid pad unlike S2k which barely manage to hit .9
And don't judge based on a single video you posted. You have no clue what mod/drivers mod the racers have.
Bottom line, Z is faster than the s2k...track or straight. It all depends on the feeling, style, and $$.
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