The is-f costs way way more than the TL, has higher insurance premiums, and way worse fuel economy. But, when you get into the lexus and start it's engine, you will experience a feeling like no other. it is a beast within and it will go like hell. Beautiful sound and a great performing car. I think you may mean the regular IS350 since the IS-F is in a completely different class as the TL. the TL is a great car.