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Thank you very much for your thoughts and suggestions Charles, Adrian and Rirakuma.
I have downloaded C1 several times in the past and can't get along with its user interface. I much prefer ACR. But the results I have seen with C1, especially from M240 files, are imo more accurate/pleasing. Unfortunately I'm on windows, so I can't try RPP, though I know since my Sony days that it definitely is one of the best converters around.
I think it is natural that if you're already used to one interface, another may feel unintuitive or outright uncomfortable. This is also partly why I never warmed up to LR -- I've been using C1 for years since C1 4.0.
However, one good thing about C1 7 is that you can customize the tools that appear on the tabs to suite your workflow. For me, I've arranged all my most commonly used tools (white balance, exposure, highlight/shadow, histogram, etc) in my "favourite" tab and also ordered them top to bottom in the general order that I use them, this helps a lot with streamlining my workflow.
I've also started playing around with the LCC profiles to eliminate colour cast, think of this as a more convenient alternative to the Corner Fix tool.