My Thoughts :

1-Instrument sound.
I am mostly happy with the Built In sounds although I do occasionally tweak them using the Sound Editor - a very powerful facility which allows the user to layer up to 4 basic sound samples to produce very complex sounds. Also, with the wide variety of Digital Effects available, you can produce some really interesting sounds.
I recently had the opportunity to spend some time on a Tyros 3 and I must say that I was 'Knocked Out' by the Super Articulation sounds! I'm sure that had there been a KN8000, this kind of technology would have been included - but under a different name of course............ But, excellent as these sounds are, this would not justify my purchase of a Tyros 3.

2-Feel of the instrument.
I have always preferred the 'feel' of the keys on the Technics instruments, compared to other manufacturer's instruments. The layout of the controls is always very logical - although the circular configuration of the Panel Memory buttons on the KN7000, took a bit of getting used to, after having them in a linear format on all the previous models. However, I'm quite happy with the Panel Memory layout now...........
Comparing the KN7000 with my albeit brief experience of the Tyros 3, I did not like the Operating System at all.

3-Sequencer.
I could ramble on about the virtues of the Sequencer and fill several pages. Suffice it to say that without a doubt, it is the most user friendly and versatile sequencer I have ever used, for simple sequencing, full 16 track sequencing and editing.

4-Your overall feeling.
It just makes me feel totally at ease no matter how I wish to use it.

5-And whatever you feel is important to you.
The Composer facility is again the best I have come across on any instrument. I use it for the greatest majority of songs/tunes which I play - live or recording - to construct styles either from scratch or modify existing styles. I bought a Tyros 1 shortly after they were released, to complement my Technics keyboard, however, trying to modify or build a style from scratch on the Tyros, was a Nightmare, compared to the Technics models. I kept it for about three months and then sold it.