I 've read some reviews on the Z1000sx and they all reckon you can't buy a better sports tourer,the only things nearly everyone moaned about were a hard seat and the exhaust! if that's your only problems you ain't got any !! 
great bikes. 
Yes I'm very happy with it. I can honestly say there isn't another bike I would have wanted even given the choice of anything.
The seat is bad, much worse than the FZ1 anyway, I can only manage around an hour before I start getting a numb 😅
I don't know what peoples problem would be with the exhaust? Other than maybe the fact its quiet? But I would imagine that's the same with all standard exhausts these days given the size of the catalytic converters on them 🤷♂️
If I had to be finicky and pick some flaws I'd say its a little vibey at high rpms, it doesn't like to turn into corners without a lot of muscle (possibly a suspension set up issue), headlights are crap until you put LED bulbs in and other than that the only other issue I've had is working on it given all the bits you need to remove to actually get at anything haha
Comparative improvements over my FZ1 I would say fuel economy (major difference, probably double the tank range), far better tacho/speedo with lots more information such as remaining miles in the tank, average mpg, live mpg etc. It's got a much smoother power delivery and a much nicer clutch.
Things that are better but I can't compare to the Yamaha;
The pannier system is amazing! So easy to click them on and off plus with the fancy kawasaki system theres little to no signs they were even on there (so no ugly racks)
3 way adjustable screen is a great, lowest setting for the "sporty" look and for racing around but the highest setting for motorways or long trips, keeps the wind right off.
The 3 level traction control has proved to be quite useful on wet rides, turn it up full and just act like it's not raining, the ecu takes care of the power so no slips or slides. The power modes are bit pointless, I think low mode cuts the power to around 100bhp but as its all up the top end its not really noticeable in a situation where you want less power. I've only used it when I took my daughter on the back for the first time so not exactly red lining it anyway.
I'm sure ABS is handy too although I've not managed to engage it just yet.
So yeah all in all I couldn't be happier. I do miss the looks of my FZ1 as it was one probably the prettiest bikes I've ever seen IMO but the green machine has grown on me.
