This is what mine looks like on my 08 250 AWD. Bit different, but just like the one Jeff posted.

 

To the OP:

I've got a 2007 RWD IS250 6MT in the UK and my dipstick sometimes has the same problem as yours.

I find that for some bizarre reason, the undulations of the 'pipe' that you stick the dipstick into means that lots of oil gets stuck in the 'pipe' and so it often redeposits itself onto the dipstick when taking it out, even if you have fully wiped the dipstick before reinserting it.

I think it's just not a very good dipstick design, meaning you often fail to get a clean reading.

Perhaps if you try on a warmer day the problem won't be so bad as the oil can trickle back down into the pan?

I checked mine last week and it was fine (we had a sudden spell of Mediterranean weather; very unusual for April!)

 

Definitely agree with you about the design - it makes things more complicated than they need to be. I'm glad in a way that ive found another person with the same issue as mine - a i knew this could not be an isolated incident.

Reading the owners manual, it does indicate to check when warm - upon doing that, the oil is just above the 'Full Dot' but before the first bend in the stick, so im comfortable with that. Ive just never owned a car like this where the dipstick gives as many false readings due to smear and what else, as this one

 

​​​​Mines like that. Over the limit by 2 inches or so when cold, once it's warmed up level is perfect.

 

I think the person who designed this oil dipstick is the same who designed the ODB II connection and it's location, I believe Lexus used the janitor instead of a real engineer/designer.