Got to play with X-T1 at the local Fujifilm store, together with Zeiss 12mm, Fuji 14mm, 23mm, 27mm, 35mm, 56mm 1.2 and 55-200mm lenses.  Coming from X-E2 and have used XPro1/X-E1/X100, here are my impressions:
 

• The EVF is not as lag free as everyone was saying here.  It feels about the same as X-E2.  Blurring still occurs when I pan the camera horizontally. The blurring is more noticeable with wide angles lenses and less with telephoto.
• The EVF sure looks big and the uncluttered display is nice (Fuji should have done this since day one).
• The handgrip design is very nice.  It feels solid and secure.  I’m using the Fuji grip with X-E2 and I’m pretty sure I can skip the additional handgrip with this one.
• The EV compensation dial is not as stiff as someone was reporting here, about the same as X-E2 and I have no problem changing it with just my thumb.
• The 4-way controller is sure hard to press.  The buttons are sloped/recessed towards the center which makes them harder to press compared to having flat buttons.
• The shutter dial detents do not feel quite as positively as X-E2, it has a bit of a mushy feel.  Same with the dials for changing metering and drive mode.
• The tilting LCD has a solid feel.
• 8fps is fast and I can keep shooting without any slow down.  With X-E2, high speed shooting slows down after a second or two.
• During the high speed shooting mode, there is no live view between frames.  All I saw were 8 frames presented within the second.  This is the same as X-E2.
• AF seems about as fast as X-E2.  It could be a little bit faster (hard to tell), as the X-T1 seems to drive the AF motor faster.
• Shutter sound is quiet, which is the same as X-E2….

See on www.dpreview.com

Albert dpreview.com First Impressions Fuji X-T1