At the Geneva Motor Show I had the chance to compare both seats and the space behind them.
I didn't see/feel any difference concerning knee space.
But the performance seats seem to have less foot space for the rear passengers. That's why I ordered the sport seats. ;-)
Thanks, that is really helpfull info! I've read on another Jaguar forum that the performance seats are heavier, altough the difference in weight was unknown. Traditionally Jaguar sport seats sufferd from a 'vertical seam', but that was resolved from model year 2018; I assume that includes the I-Pace as well.
I'll stick with the sport seats, but I hope to get a change to compare the seats like you did. My delivery is scheduled for December, so plenty of time to change my mind