i dont understand why this comparator not going in saturation region, even i am using High speed comparator.
I can see that your comparator does function, only the output amplitude is lower than expected.
Overshoots indicate something wrong with the DC power supply. I would suggest to add DC to ground blocking capacitors to the DC power supply, and check signal source impedances. You can reduce comparator gain by a feedback resistor like in an opamp circuit, sometimes it helps.