Well first of all I do not think any bank would allow u to pay more than 50% downpayment.
Secondly if u go for any conventional bank like alfalah,askari,mcb,ubl,............
In the initial payment u will pay
The amount u want to pay as percentage of car's value
First years upfront insurance
Then u pay ur instalments for the number of months u have leased ur vehicle for
Every year if kibor doesn't change ur instalments have a down ward trend in the last year thier is much difference as the insurance is not charged
In case of islamic banking
U pay the same for most banks as down-payment
(Which is not very islamic anyways)
However the instalment is flat same for as many number of months
The exception is
Bank alfalah islamic and meezan bank
Alflalah only charges the percentage u want to pay of the vehicles value not even first years insurance
and equal flat installments
Meezan charges registration upfront but thats it rest like alfalah islamic