Unclear Area


Can some someone assist me with the uploaded photo, I am using 3dsMax, and vray
I am having not clear area problem indicated in the red circle.
Is it about antialiasing, dmc or increasing subdivisions? the resolution is 1920X1080.
I have increased the resolution to 3000+ with same result, I reduced the bitmap blur to 0.5, with a little improvement.

tks for help