I am sure someone will do it in the future, and if so, I hope they do an in-the-field, side-by-side comparison because while I haven't used the F-75 LTD, or even the F-75 that much anyway, I am familiar wit the Teknetics T2 and the Omega and I don't consider the G2 to match them, overall, when it comes to depth-of-detection.
I can say, however, that having used the T2 in some trashy sites, I quickly and easily settled on the G2 and the 5" DD coil as the killer for good separation in trashy conditions. I liked my Omega just fine with he 5" DD coil, then came the G2. My Omega still gets the job done, but the G2 just handles the dense littered sites much better for me.
I haven't recovered any silver coins yet. Ample clad coins and some silver jewelry, but no silver coins. A lot of wheaties from the three home sites they are demoing, but no silver. When I encounter it, the G2 will do what it can to pull them out of the littered areas and let me know. I am not expecting it to get the depth of the more expensive F-75 and T2 and their LTD counter-parts, but I know it will do what it does best and that is handle the more challenging site environments. Quietly, too.
Monte