1) is there any chance you could supply the HDRi harbour you used? i have tried with a different HDR apparently with a bright sun and i cannot get close to the nice sharp shadows you have nor imitate your high contrast lighting effect
2) for some strange reason my background has now become one single colour. if i rotate my HDRi as you showed, the single colour changes but i never get to see my HDRi as i used to nor as you show. i must have knocked one (or more) controls, but despite a long search, i cannot see what i have done wrong.
yours,
julian darley