We're both OLTP and Analytics - I work in Financial sector and all the system I've worked are a mix of both OLTP and Analytics. Lots of the applications in the Financial sector are like this - which makes our requirements quite tough.
18 years ago I initiated a proof of concept and worked with Sybase on porting the application I was working on to IQ. It only took 2 weeks to port as the dialect of IQ isn't that much different from ASE.
There were many advantages to it but at the time it wasn't enough of an advantage to warrant a mixed environment. I was hoping of doing the same with HANA.