Tryed to find market share broken down on hp in the EU but find very little. Here in Norway this type of small tractors are somewhat unusual, both Kubota and Iseki did market them selves more as a professional tool for property maintenance and such task, and the price was also adjusted to that, very expensive.
Kubota are struggling to get a functional dealer network, for some reason they don't own the general agent and that have really set them back. Lovol (Foton) has really got good market share and that's tractors below 50hp, do think they have 7% of the total market, but of course the Norwegian market is very small in numbers.
Most hobby tractors are older and larger, if we talking new tractors almost all sales are in the 75hp and larger with exception of Lovol, but Lovol is a strict hobby tractor.
I do believe this is much the same in all Scandinavia and Finland.
Lovols success is a result of the used market is running dry, the prices are high but lower than rest of Europe and Africa so a lot of tractors go to export, Ford, Fiat and MF are sendt out, Zetor is becoming rare because for almost all are returned to the east.
The US is a very different market, you have a lot of land so getting a small farm or homestead seems quite accessible, here it's difficult to find and very expensive. Moste of Europe is densely populated so properties are small and as in Norway small farms probably are keept in the family, my small farm has been in the family since 1650 - 1700.