Had an Audi sline A6 for 5 years and made the switch to an is300h Fsport at the beginning of this year .
Build quality wise , I'd have the Audi slightly ahead . My is300h is a fresh car and has some creaks from dash and slight wind noise from windows when at speed.
Reliability wise , the Lexus is street's ahead .the first 6 months of owning the audi broke my heart . Only for a good warranty with the dealer, I would have been out of pockets a huge amount. After all had been fixed , the audi was a great car . But as I said , I'd have more faith in the lexus .
Comfort , even though the audi was am sline with 20inch alloys and a hard suspension, I think it was a more comfortable car than the lexus .
Driving experience, the lexus to me is a very nice place to be .Long journeys are a delight and the fact that it's a smaller car than my old audi, means it's easier to park, manoeuvre etc.
Running costs , the lexus is a petrol, the audi was a diseal. Enough said . I went with the is300h as I only drive my car at the weekend, I have a company vechile for during the week . Service costs seem about the same aswell.
Overall I honestly think the is300h is a great buy for anyone seeking Reliability, comfort on long journeys and a good driving experience. Also there is literally thousands of Audis and BMW on the road these days . The lexus to me is a bit unique