CX upgrade question

[usualsuspect]

I was just curious about the way that upgrades work at CX or any other airlines with the upgrade being based on performance and experience level. I assume it means you have to have the required flight time and do good on your checkrides. But my question is does this ever really affect the seniority order very much? ie: would someone hired on with low time take a lot longer to upgrade than someone hired on at the same time who comes in with a lot of experience?

while we're at it... what's the latest on average upgrade time from SO to junior FO to FO?

I am used to everything being solely based on the exact seniority number you are given so I am very interested and welcome the different approach on this!
thanks-

[sisyphos]

anybody knows the success rate for cpt upgrade ( first shot) ?

heard it is really bad on the classic, moderate on glass , true ??