I would say my English accent placement for UK accents is fairly well developed - within London and for general swathes of the country (Welsh, Geordie, Black Country etc).
In Italian I can recognize that they are different, but cannot place it.
Same for Japanese.
Mandarin... well China is a different case of dialects ...
Haven't had a chance to hear French or German regional accents yet.
I could recognise a really obvious Russian accent in German... but probably not one that is intra-country.
What are your experiences?