The new changes are a huge improvement on the MT09. I am a big Yamaha fan and have probably owned 30+ in my lifetime. They made a lot of the right changes on the new bike. I had the original version and it was a love hate relationship. It had a great motor, decent chassis but terrible suspension and the fuel injection wasn't dialed in very well. I am pretty sure it will be a very good bike but they made it uglier and that is coming from a 890R owner which isn't exactly the belle of the ball in the looks department.
I haven't ridden the new one but I would take it over the 790 but not the 890 and I'll tell you my rationale. In the motor department, the 890 will trail the MT at peak power and at higher PRMs. On a track the MT will likely pull the 890 at the end of a long straight. Where I prefer my power and where it is most usable on the street, is low to mid range. That is where the 890 is a pretty amazing bike. Brakes and chassis are clearly in the 890's favor. The 890 has some of the best brakes I've ever seen on a streetbike and I have 2 Ducatis and 2 BMWs (down from 3) in the garage. The brakes on the 890 are stellar. Suspension on the 890 is very good. I can guarantee the stock Yami suspenders aren't going to be at the level of the 890. I am a big guy on on my MT, I always felt like I looked like a monkey blanking a football. I was always wadded up and uncomfortable. Apparently Austrians and taller and lankier than their Asian counterparts. Who woulda thunk?!?!
One thing I'd like to focus on a bit more is engine design. I grew up on 2-strokes and 4-strokes, singles, parallel twins, v-twin, v-4s, square 4's, triples, sixes and rotaries. I am now over 50 years of riding and the motor designs that do it the most for me are twins and sixes (other than a square 4 t-stroke I keep). If they made 2 stroke street bikes again with a big bore, I'd be first in line but they don't, so back to twins and sixes. There is something about the firing order and power delivery of the 890R. It is very tractable and has pretty good top end pull but won't rev to the moon like a 4 or 6. But I am fine with that for most of my riding. The 270 degree firing order is the same on my 2020 Africa Twin (AT). The 890 and the AT are the bikes I ride for about 90% of my riding. Heck, they even did in my little Royal Enfield 650 and I might be addicted to that firing order now as 3 of my most fun bikes for every day riding have the same firing order.
The pull down lower and smoother than my v-twin Ducatis which start to buck and chudder below 3k with a load. Not as smooth as my Teutonic 4's or 6's which will pull from idle to redline in 6th pretty much but they have a lot of character. Not to mention they all get amazing mileage for the performance they deliver. I have found that for most of my riding (40-100mph) about 100 hp parallel twin with a 270 degree firing order seems to tick all the boxes for me. Good power where I need it, an interesting exhaust note, good economy, and an engaging character. I have much faster bikes but these twins are the ones I somehow end up riding when I go out to the garage. If I need a real adrenaline rush, I'll fire up my supercharged Kawisaki which will do rollon wheelies at 120 mph where the 890 is definitely running out of breath but the next 20 rides will be on one of the twins in the garage.
When I want to really want to hit the curves the 890 is the logical and amazing choice. If I had to keep only one bike out of the 13 currently in the garage, it would be a really tough choice between the 890R and the 2020AT. For me I can appreciate the new MT but wouldn't buy it. I don't need the extra topend pull of its motor (not like it is going to run away and hide either) and it won't handle, stop or be as comfortable as my 890 is. I'll live with the minimal reliability issues should they show up. So far nothing is a show stopper. I had a bunch of British bikes growing up and apparently they marked their territory by leaving a puddle of oil everywhere they stopped. I think it was the original British design for a constant loss oil system. I figured I never needed to change the oil as I was constantly putting fresh in...