I have finished the two batches of "standard" green teas samples from Japan and China.
Verdict 
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Green teas from
Japan were represented by (too official yeah?):
Code:
Bancha
Bancha Houjicha
Genmaicha
Kokeicha
Sencha Uji (organic)
Sencha Yamato
All of them are nice. Sometimes I have not noticed any difference between them.
Sencha Uji is outstanding. I have ordered and received 2x100gr bags of it.
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Green teas from
China:
Code:
Bi Lo Chun
China Sencha
Dragon Well
Gunpowder (organic)
Large Leaf Green
Mao Jian (organic)
Pine Needle
Temple Of Heaven
White Monkey
1 tea I didn't like at all
China Sencha
2 teas I really liked and they are my favourite besides Sencha Uji, which is simply different and cannot be compared with.
Dragon Well and
White Monkey
Mao Jian that is probably the most famous and Bi Lo Chun that is supposed to be one of the best didn't impress me more than: good green teas.
On to the last batch
....to be continues....