RoddyL, Welcome to ChefTalk!
I agree with Mike9 and with Rick Alan. Sane Tatsu is one of any number of generic brand names using VG-10 steel for the core and VG-10 steel is notorious for difficulty in sharpening.
Right away, I would suggest against any VG-10 core steel knife. I also do not like Damascus blades (once they get scratched up, restyoration involves polishing out the scratches and then the application of etching fluids - not for the faint of heart and also involving the proper disposal of probably hazardous waste for the etching fluid).
I also doubt the effectiveness of hammered blades for food release. I have not seen any evidence that it is effective.
If we are to work with you, please be advised that this will need to be a "give and take", with both you and the rest of us engaging in a back and forth dialogue.
Sooooo....
If you could answer a few questions:
Where do you live? (I ask, because knife availability is to a large degree limited to the country which a person lives)
What is your overall budget?
What is the largest blade you currently work with?
How are you currently keeping your knives sharp?
What kind of cutting board do you use and how large is it?
What is the largest number of people for whom you will be preparing a meal in a year's time?
What type of foods do you usually prepare?
Now, for a little bit of editorializing.
About sharpness.
With use, every knife gets dull. That's a fact of life. The rate a knife gets dull differs between knives, but with use they dull.
The only good way you can guarantee that your knives will get sharp and stay sharp is to do it yourself.
Here's a very good description on how to sharpen by Chad Ward:
https://forums.egullet.org/topic/26036-knife-maintenance-and-sharpening/
And here are some excellent videos on how to sharpen by an expert, Jon Broida:
https://www.youtube.com/user/JKnifeImports
Next, what you use for a cutting board will, to a very large degree, determine how fast (or how slow) your knife dulls. The best boards are end grain hardwood, properly oiled.
And that brings up money issues. The cost of a knife is only part of the overall cost. The cost of sharpening gear and of a good cutting board also have to be considered. If that means getting a less expensive but serviceable knife, so you can afford a good board and basic sharpening gear, so be it.
If your goal is just the knife, then you will soon be disappointed. But if your goal is having a knife that you can keep sharp, then you will be on your way to being able to enjoy food preparation.
Galley Swiller