Because this S90 uses the same 'Scalable Product Architecture' as its XC90 SUV stablemate, it also uses many of the same engines too. One change though is the availability of a smaller diesel than you can get in the XC90 - the 190PS D4 unit borrowed from Volvo's smaller S60 and V60 models. Next up is a 235PS D5 twin turbodiesel, also with 2.0-litres and four cylinders, another member of the company's efficient 'Drive-E' engine family. D5 models come with AWD. All S90s come only with smooth 8-speed auto transmission. There's also a 190hp T4 petrol engine and a 250hp petrol T5 unit.
At the top of the range lies a T8 Twin Engine petrol/electric plug-in hybrid model. This delivers a combined 412PS output, with a thumping 640Nm of torque. 62mph from rest is dispatched in under 6s. There's also a more conventional T4 190bhp four cylinder petrol turbo unit.
This is certainly a more credible full-sized executive saloon than anything Volvo has brought us to date. The S90 has a proud yet non-aggressive face, characterised by a concave grille - apparently a homage to the Volvo P1800 - that's home to the brand's distinctive 'Iron Mark' logo. The T-shaped 'Thor's Hammer' lights are recognisable from the XC90 and deliver a powerful sense of direction that makes this car unmistakable on the road.
Step inside an S90 and if you've previously tried the brand's second generation XC90 model, it'll all be pretty familiar, though a difference lies with smart air blades that stand vertically on each side of the Sensus user interface. This massive tablet-like touch screen control plays a key role in creating an interior that is modern, spacious and uncluttered. Volvo's clearly put a lot of budget into driving up materials quality and this XC90 gets soft leather and wood with handcrafted details, including diamond-cut controls for the start/stop button and volume control. The boot's huge but if that's not enough, then the brand is also offered a spacious V90 estate version of this design.
Prices start at around £35,000 for the entry-level D4 diesel or T4 petrol models. Figures elsewhere in the range swell up towards the £50,000 mark, as you'd expect from a car in this class aiming to go up alongside full-sized executive segment rivals like BMW's 5 Series, Audi's A6, Mercedes' E-Class, Jaguar's XF and the Lexus GS.
Top models can be ordered with features like 21-inch alloy wheels and powered, heated and ventilated seats trimmed in Nappa leather. Inside, the tablet-like touch screen in the centre console drives the minor controls and a whole host of Internet-based products and services. Audio services in the plushest variants come courtesy of a monster Bowers & Wilkins stereo. The electronically controlled air suspension has choice of five modes, including one where the driver is free to tailor the settings to his or her personal taste.
S90 safety gear includes a run off-road protection package which tightens seatbelts and activates energy-absorbing technology in the seats when the car detects challenging terrain ahead. Another system is the auto-braking feature, which cuts in if a driver pulls out in front of on coming traffic. Plus the S90 also introduces a world-first - large animal detection - a system capable of detecting large animals such as elk, horses or moose, night or day. All these safety systems aim to bring Volvo closer to its vision of nobody being seriously injured or killed in any of its vehicles by 2020.
With the D5 diesel most S90 buyers will choose, expect 58.9mpg on the combined cycle and 127g/km of CO2. If you want to do better, you'll need to look at the lesser-powered D4 diesel version, which can emit 116g/km and manages a combined cycle showing of 64.2mpg. At the top of the range, the figures for the T8 Twin Engine petrol plug-in hybrid model are eye-catching. This derivative delivers just 44g/km of CO2 and up to 26 miles of pure electric driving range. The T4 petrol variant manages 42.2mpg on the combined cycle. The T5 petrol version achieves combined cycle fuel economy from 42.8mpg and CO2 emissions from 154g/km. For business users, its first-year benefit-in-kind (BIK) tax rate is 31 per cent.
Depreciation will be a key consideration for potential owners. It'll be interesting to see to how the market responds to Volvo's new direction in style and quality here. Think in terms of RVs that are comparable with a brand like Lexus in this segment and you shouldn't be too far out.
Don't expect Volvo to go threatening Audi, BMW and Mercedes sales volumes overnight with this car: it won't be imported in those kinds of numbers anyway. A more realistic objective though for this S90 will be to slot in behind Jaguar's XF as a 'best of the rest' contender in this segment. That's no bad place to be.
A growing number of thoughtful executives are looking for something more interesting as their next management level company car and this S90 is well worth a test drive for those of that mindset. It certainly gives this Swedish brand a much stronger offering than it's ever had before in this sector.