My experiences...It feels like it ultimately comes down to the free-thinkingness, not always the gender of a cisgender.
My transgender friend warned me very early into my decision to accept my transsexuality that women are bad because they can pick me out as a transsexual and because that things will go down from there... D:! In my cisgender friend group, when I told them I'm glad that they were helpful, or something like that, they told me to be careful and that plenty of women are really unaccepting of transsexuals, and I just had a shot of luck to end up with a group that wasn't like that. My friend in VA knew it was coming, and has a distressing fascination with how a mentality gets affected by transition. XD
As far as my male friends went, all of them were pretty accepting up-front and everything. If anything, it's been something to open a better comfort zone, as much as I don't do any crossdressing or anything at my own expense... D:
Almost all the women at my work who know have been pretty cool about it, a couple found it interesting but they've been at least ok with it. The men have not been gossiped to, so the couple that overheard about it have a very 'go for what you want' attitude.
On the other hand, it's been pretty much all women who haven't taken to me well so far. My mother was of course the most significant woman hurt by this and at first was very mean, but when she was calmed down she realized how she reacted and apologized, but she's clearly uncomfortable with it and the next few weeks are gonna be preeeetty rough. One of my managers takes me under her wing as a mother-figure in the workplace, and she reacted pretty badly too. Finally, there's my ex-girlfriend. She might be a denying FtM but she venomously opposes the idea of me transitioning despite 'being' best friends with an MtF already. (I have a state of disbelief that she's honestly so friendly with that MtF though.) My transsexual friend and her teacher, both women, have not really accepted much of how I want to be as being a woman, mostly in the sense of romance-related.
And of course, finally me, yeah? x3 Even before accepting my transition, I have really been welcoming of whatever walk of life someone chooses. It's just always been the right thing to do. ---I always had a small half-joke that I could befriend a serial killer who wasn't busy trying to kill me, even.