So I made an official complaint, sent back to service center, the engineer assigned gave me a lecture on the characteristic of the transmission before test drive session. Then test drove my car, initially told me it was normal, after I insisted and described different jerk at different speed, he reproduced the same jerk and noise from low to high speed. Only then he agreed to replace the transmission.
The issue was caused by oil leak into the transmission, apparently there was a leak somewhere.
Gotten my car back, it drove more like automatic without the noise and jerk for few days now.
Thanks for the information. So your car does not exhibit any jerks now. Impressive, since my understanding is the Powershift transmission will still show some minor jerks in low speed acceleration. It is just whether the jerks are more serious, which in your case is a defective transmission.
Somehow I have got used to the jerks, and in my case the jerks are minimal so it's not so bad. Now I am more bothered about the grinding sound. Not too sure where does this sound come from. It seems like the grinding sound especially when going uphill at low speeds, is getting louder with mileage. Also, there is a very slight sound from the steering wheel when turning left and right, something like a plastic friction sound. Although it is very minor, I will go and complain after CNY.
It appears that this Ford Focus seems to show more problems than my previous Nissan Sylphy.