Well I Guess I'm in a position to answer here as I have a company car A4 2.0T S-Line and an A8 personal car but I'd still recommend the company car. A lot of it depends on your mileage and how many miles youve got on your 8 and what size engine etc, Miles per gallon on my A4 is still nearly double that of the A8 even though its petrol and the only thing I'd do different in retrospect would be to have had quattro on the 4 too as I find myself using the 8 more in the snow.
The A4 is 212bhp which is pretty spicy for a 2 litre.
I suppose another option is to do what I do - take the Company car then keep your 8 for smiles and weekend fun! best of both worlds and also the 8 will need less money spending on it so often as you wont run up so many miles in it 
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Confidence is the feeling you have before you know better . . . . 
Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange
2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee
20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble
Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior
Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble
Audi A8L D2 4.2 Petrol with LPG - Ebony Black
Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black
Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior
and some other A8's A8L's and Mercs
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