Disclaimer: I'm just a random Japanese native and my answer below isn't based on formal research or anything like that.
The feminine 「わ」 seem to have become almost extinct. You see it in text books and novels, but it's extremely rare to hear people actually using it.
The kansai 「わ」 is different from the feminine 「わ」. The feminine 「わ」 is used in 標準語 or 東京弁 and not in 関西弁. The kansai 「わ」 is only used in 関西弁.
The kansai 「わ」 is used by both male and female, and has no feminine effect even when used by female. The feminine 「わ」 does have an feminine effect, and is sometimes used to signal that the character in a book is a female etc. The two わ are also differently pronounced.
Interestingly, 「わよ」 is exclusively feminine 「わ」. Male usage of 「わよ」 is associated with transgender and homo-sexuality (talents like 美輪明宏 use it, presumably to emphasize their feminicity?). Usage of わよ seems to be rare among Japanese female (at least in younger generations).
So to summarize, Japanese female mostly use something else than わ nowadays.
EDIT: As an anecdotal evidence, I'll cite this chiebukuro question:
For ppls opinion, you can take a look at the quetsion
(Many obnoxious comments unfortunately, but there you go)