No comparison between these two, neither in pricing nor brand positioning.
Mark X is in a different league altogether, which is positioned above other Toyota brands like Premio, Altis, Corolla, etc. Civic X is a direct competitor of Altis Grande.
It depends upon your priorities; 0 meter car PKDM Vs. 11 year old JDM. Plus Mark X can be easily bought within 2M, which leaves a pricing gap of 1M+ for Civic X Turbo.
Drive of Mark X is far superior any day, but do keep in mind its condition would be deteriorated now, while Civic would be brand new. At the end of the day, it boils down to budget, and these cars are not within the same budget category.