Best of the Canon TSE?

Are the features all the same on all three? I assume the L will have the weather sealing and the other two will not, any other major differences?

Which of the three is the sharpest? 24, 45 or 90?

And finally are they all able to accept the teleconverters?

Thanks.
--
Lundy

'Sometimes the best part of wanting something is not having it.' ME 1994

http://www.pbase.com/lundy