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I'm not extremely familiar with Perl 6 to be able to draw a comparison.

From what I know about Python 2/3, it's that you can write maybe 90% on average/in general of your code the same way without much thought about the differences. However, if you do wish to adopt the new features, there's plenty to keep you busy writing scripts for at least a few months, maybe even a year.

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Perl 6 is a different language from Perl 5. It's considered next in the "Perl family of languages". There are various things you can do to get interoperability between them, and run code from one in the other's interpreter, but the changes are much more pronounced that Python's 2->3 changes. It's closer to the difference between PHP and Perl 5. People familiar with Perl 5 will find a lot of the design decisions and concepts similar in Perl 6, but it will still be like learning a new, but similar, language to Perl 5.

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