I have coffee bean silestone countertops in my kitchen installed about 8 years ago. It always had a dull finish, so I use Car wax (Turtle Wax)a couple times a year and it seems to work.
It puts on a nice shine and the water beads with less rings. The down side is it does take a little elbow grease.
A polished or shiny finish is most common (but no the only type) on Silestone although it may not be a super high-gloss. How "shiny" a surface can get depends on how hard and the composition of the stone.
Some granites and marbles will take a shine better than others. Even though man-made quartz countertops like Silestone are very hard, they will still only be able to get so shiny and may not be as shiny as other surfaces you see.
The picture does show reflections in the Silestone surface, so it's likely that the finish is as it should be. Unlikely anything is "wrong" with it.
Wax can be used, but it only makes for more involved maintenance as it builds up and like you said... takes work.
We just purchased black Silestone counter tops and when we touch it or set a pan or plate on it it leaves a mark that you can still see even after wiping. What can we do to prevent this?
This is a common problem with dark and especially black honed granite, which is easily solved by applying a color-enhancing sealer that makes the stone darker so the finger prints are not so noticeable.
Of course, you cannot apply a sealer to Silestone quartz countertops, so it's just a matter of cleaning it. If the finger print oils are staining as I think you suggest ("leaves a mark that you can still see even after wiping") then that could be a problem you'll need to contact Silestone or your fabricator about.
Although, you may not be using the best cleaner, which may solve the issue.