Signed sleeves. Genuine or fake?

Hi,

I'm journalist and Queen fan more than 30 years. I add two images of signed sleeves, Jazz and a Night at the Opera. The question is - are the autographs genuine or not. Both sleeves are signed at the same time. The autograph of Brian looks little odd. Or what you think?
P.S. Generally - it will be interesting to know how often you meet fakes on the market. Half or even more of all items?
Best wishes,
Pekka

Difficult to tell on this one.  Nothing too worrying, but they all look kinda hurried apart from Roger's, and being signed in the same pen is always something of a concern...  Good luck.