Don't have one of these primes, but do have the 18-55. It's lighter but about the same size. I have the Gariz half case and a homemade paracord* wrist strap. The grip and strap make it very secure in the hand. It's OK, but pushing where I personally want to be with this system.
You guys are gonna have my other X-T2 go up for sale
Right now the X-E3 is $100 off.
I use the Gariz grip and a custom paracord wrist strap. The combination makes it so I can hold the camera securely with just my finder tips.......The body is really small. So small that if I hold it one handed for long, it starts to fatigue my fingers. A grip will fix that. And if I hold it by the lens like I should be, there is no issue. But I seem to want to shoot one handed with the X-E3. Probably due to the small size of the body. The larger lenses, like the 16mm 1.4, are not awkward if you support the lens with the left hand......