Thank you @HS287011 for your reply much appreciated, yes tried the same thing, right not being able to achieve the same quality as Vray and corona. if you find any solution to this in future please do share it, will do if I find a solution. 
Thank you @HS287011 for your reply much appreciated, yes tried the same thing, right not being able to achieve the same quality as Vray and corona. if you find any solution to this in future please do share it, will do if I find a solution.