I'm thinking of either the 27mm pancake, or this lens as a walk around prime for my x t10. How do they compare, optically?

I own both (and the X-T10), and I originally purchased the 27mm pancake for street photography on a trip to Chile. I later bought the 35mm f2 after it was released. You can't go wrong, as they are both great lenses, but they are definitely different. Optically, I have to give the edge to the 35mm f2, especially if you are a fan of the 50mm focal length (which is a normal focal length). It is super sharp, and is more versatile than the 27mm. It is f2 vs f2.8 as well. It'll handle street photography to some portraits, and if you want just one prime this is a good option. I like the aperture ring as well. If you want to adjust that on the 27, you have to do it with the camera body. The 35 is also fairly small, so while it'll stick out more in a pocket, quickly stashing it isn't out of the question. The 27mm is great for a pancake. Sharp, pretty fast, fun, and you can forget about it and use your camera like a X100T. Perfect for inconspicuous photography and you can easily throw your camera is a jacket pocket after. Both are solid but if I were to personally get just one, I would go with the 35mm.

shld i get this lens then xt-10 body or get the xt-10 with 16-50mm?

The 35mm f2 is a fantastic lens. It's sharp, weather resistant, and fast. It's turning out to be a bit of a stunner from Fuji. The 16-50mm is a good lens but cheaply made. The XC is the budget range of Fuji, though to be fair Fuji just don't make bad lens. I'd buy the 35mm and when the budget allows maybe buy the Xf 18-55 which is a better made all round lens for a zoom.

How is it with portraits?

The 35mm f/2 is like a 50mm film lens in field of view and like a 35mm film lens in depth of field. If you like shooting portraits with a 50mm film lens then just open this lens up one stop in comparison to get a similar depth of field. The sharpness, color rendition, and bokeh are excellent. The gentle gradation from in-focus to out-of-focus areas is very pleasing for portraits. The 35mm also focuses very quickly and quietly for moving subjects. With that said, if you typically prefer 85-100mm on a film camera for portraits then you should look at the Fujinon 56mm f/1.2.

will this lens be a true 35mm when coupled with the X-T2 and/or the X-T10? or is there a crop factor?

No. Both cameras are ACSP which is cropped regardless of lens. 35mm APSC is equivalent to 55mm Full-Frame, and 22mm APSC is equivalent to 35mm Full-Frame. You can get the same FOV up to a point with wide lenses.

Brand	富士フイルム(FUJIFILM)
Model Number	XF35mmF2 R WR
Sensor	CMOS
Optical Zoom Range	1 x
Zoom Range (including digital)	1:1
Lens Fixed Focal Length	35 Millimeters
Focal Length (wide)	35
Focal Length (tele)	35
Aperture (wide)	2 f
Min. Aperture (tele)	22
Shutter Speed	0.08
Lens type	Single Focus Lens
Lens Configuration	standard-prime
Lens Mount	Fujifilm X
Image Stabilization	Digital
Shooting Modes	Auto, Program, Aperture Priority, Shutter Speed Priority, ISO Sensitivity Priority, Manual
Lens Motor Type	固定式
Color	Black
Batteries Included	No
Product Dimensions	10.41 x 16 x 9.65 cm; 408.23 g

Fujifilm Fujinon XF35MMF2_R_WR_B Lens (Black)*Fujifilm XF35MMF2_R_WR_B Lens

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