Performance at 500 Kms
Keep in mind that during the break in period of the engine it isn't performing at its peak.So consider this review an incomplete review.
First impressions: Start the car and put it in D and the car wants to run
.I literally went like "ruk oye kahan bhag raha hai"
Car runs just smooth
light throttle application (1500 RPM) and you are at good speeds.Acceleration is Great 
Normal Driving you wont at all find this car sluggish as reported by some.And please keep in mind its a Family sedan and it has more than enough acceleration for its category.I haven't tried full throttle as car is in its break in period,but have touched 4000 RPM once and man it tucks you back in seat.
And I have this feeling that if I press the accelerator fully the acceleration is going to be very good and it feels as if power is lurking just behind the pedal.
For people who drive around with their families and are sane drivers,I can confidently tell you that wont find the car lacking in power even with AC.
Turning on AC doesn't make you feel that car is under load,coming from a 660 JDM Alto,I can tell you that in that car when AC was turned off there was more power instantly but no such thing in City Thankfully.
Had a trip of 25 kms with 4 Adults,1 teen and 3 children with A/C on all time except at end it got very cold so had to turn it off,
And there was no obvious lack of power,a very slight power loss was felt and other wise engine was smooth.I didn't go above 3000 mostly I touched 2000 RPM and thats it.
When transmission changes from 1st to 2nd gear a slight jerk can be felt but after that you cant tell if the car is changing gears unless you are looking at the tachometer (RPM meter),a slight feedback is present when gears change but now much felt.
I never felt much of a need to push the car above 2000 RPM at highways,sometimes a little push which was in case of uphill climb on expressway upto 3000 and thats it.
In short car dosent feel underpowered even in its break in period
Dont take my review as a 100% correct description of the experience,its possible that this car doesn't meet your expectations so please test it yourself before purchase,I didn't drive this car before buying and was worried because of people saying that it ia very sluggish etc but I am satisfied very much Alhamdullilah.
@samahir @atifji @alishankhann