I am not familiar with your model car the CT......but I have a 12 page tire thread on the LS430 forum u might want to read. quick answer....sure u prob cant go wrong w the MXV4s.....but u ask about the Pirellis. I have them on my 04 LS430 and they are a very nice tire. On tire Rack it is very difficult to find a negative remark about the Pirellis and there are tons of reviews. The MXV4s are a great tire too but for some reason get very mixed reviews...some great...some say will never buy again....Michellin also has the Premier AS that just came out which is getting great reviews.......
I will just say I am very happy with my Pirellis......good luck with your search