2 days back, I had a 5th passenger in car.
I was worried that they may feel uncomfortable on the backseat, but on asking 20kms ahead when stopping the car, they were all happy and said all ok, no issues, in fact they adored the comfortable seat!
2 were mid to heavy built, one very slim and seated between the two heavier.
Course with 2 only on backseat there'd be lots of space, but it's not that it can't take 3 normal built people comfortably enough.
They were all praise, although, yes, it's lesser spacious than Sportage, Tucson MG, yet very balanced in it's own unique way.