No. I hate the uncertainty of two separate tickets, with zero reprotection in case of IRROPS, so I would not recommend it. If you have checked bags and CX doesn't tag them through (which I believe is oneworld policy now on separate tickets with non-alliance members), it becomes virtually impossible.

This being said, if this connection were on one ticket, I would be very relaxed. In principle, 85min is plenty of time for this connection in ZRH, and if the CX flight arrives on time, everything will go smoothly. And if not, LX would rebook you.