The Mercedes S-Class is packed to the rafters with technology, and is also a very comfortable and exceedingly well-appointed luxury saloon. The Audi A8 is more refined, particularly if you're looking for a diesel, but we’d opt for the S580e anyhow. It’s one of the most impressive plug-in hybrids on sale, combining many of the best points of the standard S-Class with a substantial real-world electric range and low company car tax. On top of all of that, the S-Class’s interior simply can’t be beaten for sheer wow factor.
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