@dorfpunk said:
...In this case the sky is from here - http://www.gaieus.hu/su/Cloudy.style...
And to give proper credits, (I think) it was Chris Fullmer's sky creation shared back on the old @Last Forums.
And yes, certainly it's kind of "refreshing" to see some native SU output nowadays when we are spoilt with the abundance of rendering apps and rendered models!