I have sent my Jolla for repair(vibration, speaker, reboots) and have been (re)using N9 as main phone for several days now. Some comparison below:
- Jolla is way(3x) faster, but N9 feels smoother and more polished and complete product.
- N9 AMOLED screen is joy to look at, it has a magnitude better readability in the sun than Jolla screen.
- N9 feels premium, where Jolla feels cheap.
- Jolla UI had evolved to the right direction from N9, getting rid of buttons. I really miss Jolla swipes on N9. But still Jolla had a long way to go to make its UI logical and easy to use all the time with various tasks. It lacks the small tricks and clever moves that are making the user experience WOW.
- overall Sailfish in Jolla wins hands down over Harmattan, only inferior in smoothness and visual appeal. I hope Jolla to stay afloat for producing Sailfish OS 2.0 - that will be something!

So in conclusion - Sailfish is really promising and heading down the right track. But HW Jolla uses is just cheap and lacking the Finnish design virtues.
Hope Jolla will do its homework and shine with Jolla 2 soon.