I'm taking CT5 this sitting; is it my imagination or is it definitely a longer syllabus than 105? I also noticed CT4 seems to be way longer than any of the old 100 series exams. There seems to be roughly the same amount of material in the CT exams, but spread over 1 less exam. Am I just paranoid?
It's your imagination - 105 had a lot of stuff that has been moved onto ST1, ST2 and ST4. CT5 is an easier option. As regards CT4, it replaced 103 and 104 - ask yourself which you would rather do?
And a whole pile of stuff from 104 was moved into it. I didn't say it was any harder, just quite a bit longer than old 104.