The Audi Q9 is up against Mercedes, Chery, Omoda vehicles - plus another model from Audi itself. Johannes Neudecker/dpaAudi has unveiled its huge Q9, which will arrive in the UK later this year as one of the largest cars available here. With space for up to seven, a large boot and a robust V6 diesel engine, the Q9 is crafted in the image of the classic large SUV.Though when it gets to the UK, it'll have plenty of rivals to contend with. Let's see what the Q9 is going up against.Volvo XC90/EX90The age-old go-to choice within the premium seven-seater market has been Volvo's XC90. Well-finished, comfortable and near-endlessly practical, it's a car which feels ideally suited to larger families.AdvertisementAdvertisementMore recently, an electric version – the EX90 – has provided a battery-powered alternative to the XC90 which still gets all the practicality you could want.Land Rover DiscoveryMuch like the XC90, the Discovery is a car that has been around for quite a while now. The latest model has all the off-road tech you'd expect from a Land Rover, yet its full seven-seater status makes it a very handy option if you often transport larger groups.The Discovery also feels very well finished inside and has JLR's clever Pivi Pro infotainment system which is packed with features.BMW X7Before the arrival of the Q9, the X7 had been one of the UK's largest cars and that means it's got acres of space to offer inside. It also feels very upmarket thanks to top-tier materials and lots of glass used throughout. The huge widescreen infotainment system is easy to use, too.AdvertisementAdvertisementLike the Q9, it's available with a series of rather old-school engines, including a smooth six-cylinder diesel and even a 4.4-litre V8.Omoda 9While the Q9's rivals are dominated by offerings from heritage brands, it could be argued that a relative newcomer – the Omoda 9 – could also be a competitor for the big Audi. Priced to undercut nearly everything else on the market, the 9 offers a huge amount of equipment for the money, as well as a spacious interior.Exclusively available with a plug-in hybrid setup, the Omoda 9 has an electric-only range of up to 93 miles, making it a usefully cheap car to run.AdvertisementAdvertisementMercedes GLSThe Mercedes GLS is a luxurious seven-seater and one which has recently been updated. As the flagship of the Mercedes SUV line-up, the GLS gets all of the latest equipment that the German brand has to offer, including a huge "Superscreen" display which links passenger, infotainment and driver readouts together under one large piece of glass.The GLS can also be equipped with dual 12.3-inch displays for the middle-row passengers to watch films or browse media on, helping this car to deliver a truly first-class experience.Audi Q7You could argue that one of the Q9's rivals lies within the same Audi family. The Q7 is another much-loved car here in the UK, and one that has proven popular with thousands of drivers who value its refined driving experience and strong engine range.The third-generation Q7 has just been released, too, introducing a bold new design and lots more technology to this popular seven-seater.Audi's Q9, seating up to seven people and competing with the Mercedes GLS and BMW X7. TSP/Audi AG/dpaThe Volvo XC90 (l) is one of the competitors for Audi's Q9 alongside similar vehicles by Land Rover, Chery, Mercedes and Audi itself. Sebastian Gollnow/dpaYou could argue that one of the Q9's rivals lies within the same Audi family. The Q7 is another much-loved car here in the UK, and one that has proven popular with thousands of drivers who value its refined driving experience and strong engine range. Audi AG/dpa-tmn