I personally like the EscaineLeather seats. They don't get hot in the sun, and they "grip" you much better than leather will (important for cornering).
Other 2002 changes to note:
1. New Larger Armrest/Center console.
2. Navigation option.
3. Auto-Dimming Rearview Mirror with compass.
Also the IS300M (manual) will get some additional changes,
4. IS300M gets stiffer suspension.
5. IS300M gets color coordinated steering wheel.
I might have left out some differences, but those are the main ones.