These were my feeling on the Sig 365 when I shot the Sig along with 4 others. We ran a 1,000 rds through the gun. The pistol had too narrow a grip to the receiver for some of us to get a good handle on the pistol, and not ride the slide. In fact we warned all shooters each time they were ready to shoot the gun to be careful too not ride the slide. We had 6 failures which we contributed to user error. This has nothing to do with the quality of the gun. It was a very nice shooter and nice quality. And I think by just comparing the Hellcat to the Sig, you can visually see that there is more real estate for the off hands. I personally like the fact that the Hellcat does not have the bulky take down lever or slide lock.They are recessed in much better so as not to be interfered with while shooting.
I would say if you do have a size large hand to at least test fire the pistol to be sure it is a good fit. Or be ready to learn to adjust your grip to accommodate the size of the pistol in relation to the receiver and grip narrow space.