IN top-line Sports Luxury guise, the IS250 is swimming in very dangerous waters amid killer German competition. After all, $80K is a lot of money for a model that kicks off at under $54,000. Yet spend a good deal of time behind the wheel and then tally up the standard features, and you’ll realise that Lexus is a deadly predator itself – not least because the Toyota luxury brand's latest baby exceeds in areas that the IS250’s rivals have been falling alarmingly short in of late.