I have to agree with Trip and Richard. It's never going to compete against a BMW X5 in a sprint, but it is surprisingly swift. What the Sorento is great for, is torque and stability.
You can feel the torque building from 1500rpm and it just gets stronger up till 3000rpm, where it levels out. Fuel consumption is better than my works van (Merc Vito) which is on the better side of 30 mpg (just) but probably the biggest bonus is how stable and secure the car feels with a van attached to the rear. We have a Bailey twin axle, and apart from a little pitching as the combination goes over a badly repaired road (a common twin axle problem), you can sometimes forget that it's there.
I'm sure the new Sorento will be a fine car, but it will probably have a price to match. You won't feel short changed with the present one.
Hope this helps,
;o)