Space and practicality

Front space, rear space, seating flexibility, boot

Leg room in the front of both cars is generous, and while neither of these low-roofed fastbacks offers quite the head room of the best executive saloons, they aren’t exactly cramped.

Although neither offers generous rear space, both have enough room for a couple of tall passengers. The steeper rake of the S5’s roofline means head room is tighter, while the Stinger has slightly less leg room and foot space under its front seats.

Both have good luggage space, too, accessed easily via their hatchback tailgates. Being deeper and consistently wider, the S5’s boot swallowed seven carry-on suitcases to the Stinger’s six. More room is available if you drop their split-folding rear seats; it’s a 60/40 arrangement in the Stinger and a more useful 40/20/40 in the S5.

Audi S5 Sportback

Official boot capacity 480-1300 litres Suitcase capacity 7

Rear head room is tighter in the S5 due to the steeper rake of its roofline. However, its rear seats have a more practical 40/20/40 split-folding arrangement, while its boot is deeper and wider, allowing it to swallow one more suitcase.

Kia Stinger GT S

Official boot capacity 406-1114 litres Suitcase capacity 6

Both cars have acceptable head room and decent leg room in the front. Neither offers generous room in the back, although there’s enough for a couple of tall passengers. The Stinger has less rear leg room and foot space, though.