There is a Zetor, Branson, Century Forum here - check it out.
They are in fact made by Kukje in South Korea and were also sold as "Century" brand a few years ago.
There is a slightly smaller frame Branson as well, with 3 cylinder engines.
The "large frame" 4 cylinder ones are something like 38, 42 and 47 HP
the smaller frame 3 cylinder ones are 28 and 35 HP.
Engines are variously Yanmar, Mitsubishi, Cummins and I think Subaru - but I'm not very sure about that.
Loaders are by Amerequip and Humpolec, back hoes are by Amerequip.
They are quite a bit heftier than some other tractors of the same HP range, e.g. the small frame ones are about 3600 lbs, the large frame 4,000 to 4,100.
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What LITTLE I know about vineyards is that drainage MATTERS ! (-:
I have read of the need to sub soil or chisel plow to 2 or 3 ft., which MIGHT require a tractor with some MASS.
Not that you yet know whether that would be needed and if it is you might be best off to hire that job out as a one time need.
So, yeah I would look into the smaller ones as well.