I've owned very many Porsche cars and the answer to your question (not to annoy this model specific forum) is.... NO, its not a comfortable car.... relatively speaking! Even speaking in Porsche terms my 928 is like driving a suite of the most comfortable furniture ever made. My old Cayenne is pretty comfortable with an upright seating position.
A few days after I bought mine I travelled on a 500 mile round trip and when about an hour from home I got really tired so I pulled into a motorway service lay by, parked up and grabbed the seat control to put the seat back and have a few ZZzzzzzz..... the rest you can figure out!
It's not an S class merc or a 7 series BMW though and offers a different skill set entirely to what these cars offer a buyer! The 'long lads' here have said they are comfortable in theirs so I'd listen to them but I'd urge any prospective buyer to drive any car on their list for a good while before they put their money down... i.e. make your own mind up man!