Colinsburgh

Hi, my GS300 just had it's 20k service at a Lexus dealer. The dealer reported 80% wear on both front and rear pads and susgested I had them replaced at a cost of about £400 saying they wouldn't last to the next service. This is my first Lexus after 2 Rover 800s, 2 BMW5 and 2 E Class Mercs. In all this time I've never replaced front pads under 30k and have never had to replace rear pads despite doing upwards of 20k a year. Is this sort of wear normal on Lexus?