Objective testing of the FRS chassis against the BRZ chassis established that the BRZ is quicker. Subaru/Toyota eliminated the differences between the two cars within one model year I believe.
All the Top Gear celebrity lap times are conveniently listed in this article:
https://en.m.wikipedia.org/wiki/Top_Gear_test_track
Comparing the Liana to other cars is enhanced by the F1 driver lap times which presumably are the quickest possible lap times for that car.
Comparing each car model across the years can be done by calculating the delta between the quickest times to allow for an across the board driver comparison. Ease of driving can be derived by comparing the average lap time across the models.