An outright no. Aamir has given way better performances than PK which was an overrated film and overrated performance.
Aamir's performance in 3I was much much better, srk in Fan and hr in guzaarish were also better than aamir in PK.
Before any lord decides to comment on this answer, keep in mind.......I have given my answer on the basis of acting quality, not box office. So the concerned can go and worship their God elsewhere.