The F113 is a very good performer. I took some TrueRTA charts at about 3 meters from both it and the SVS PB12-Plus/2 with the WOTW Lightning scene.
The Fathom is subjectively more powerful, deeper, and cleaner that the SVS, in a box which is MUCH smaller. It also delivers excellent performance on a variety of material in our rather difficult room using only the built in ARO system.
While relatively expensive @ $3200, less the price one can negotiate, it does an admirable job in delivering both highly articulate, musical bass along with SOCK you in the gut, visceral, shake the room bass.
MY wife gives it REALLY high marks for its appearance, too.
To give you an idea HOW good it is, I did the graphs of the 113 first, then the Plus/2.
After graphing the Plus/2, I wanted the superior bass of the 113 enough to unplug the Plus/2 and put the 113 back. Lugging these guys around is no easy task.
One note, these graphs are with the latest TrueRTA software, and really should no be compared with the results of the older RTA tests.
Here is the Plus/2 on WOTW.
And the Fathom 113