People often conjecture about what percentage of luck there is in poker and what percentage skill. Probably you won't find two experts who will agree on this thorny subject. Anyway, it partly depends on the game you play. For example, there is much more variance in Omaha than in Omaha high-low eight or better.

Perhaps in a cash game it is 80% skill and 20% luck and in a tournament 60% skill and 40% luck. The reason for the higher randomisation in a tournament is that you, not only have to suffer the slings and arrows of outrageous fortune caused by the cards you hold, but also have the randomisation due to the opponents you meet.