I think beside familiar PostgreSQL enviroment there is not much advantage over SAP HANA. I listed advantages of HANA on my posting
https://news.ycombinator.com/item?id=6466222
Other than the marketing buzz from SAP, I have not seen any reputable (neutral) comparison between Hana and Redshift that includes price. I also have never met anyone that uses/run Hana that was not already an SAP ERP client, albeit the fact that SAP keeps saying Hana is the fastest-growing product in the company's history.
Besides all the marketing buzz SAP has been throwing it out there, how many companies actually use it with a decent amount of data (at least 10TB+ range)?