Many dont bother to upgrade 1.11 , because they think its only for windows 10 support. But with 1.11 you can use the FLASH in M+E MECHANICAL+ELECTRONIC Shutter mode. So everyone still havent updated to 1.11 do it
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I found a good website which shows the 27 key differences between both cams. Might be helpful.
http://www.wexphotographic.com/blog/fuji-x-t10-vs-x-t1-27-key-differences