The Tspark system fires both plugs simultaniously on both the exaust and compression strokes.
On the CF2 system, coil one does the primary of cyl 1 and the primary of cyl4 and fires on the exhaust and compression strokes. Coil 4 does the secondary of Cyl1 and secondary of cyl4 on the exhaust and compression stroke. This means that if a coil fails, you still have some form of ignition for that cylinder.
The CF3 system where the coil does the primary and secondary of the same cylinder still works in the same way but you loose the redundancy of spark. For that reason, the CF2 is actually better as a slightly degraded coil wouldn't harm the running of the engine.
This was confirmed to me when I realised my coil for cylinder 1 was broken and not making contact with the plug in my GTV. The engine continued to run fine (but started better when i rectified the fault).
Alfa GT 3.2 V6 - Daily Driver.
Alfa 145 QV ph1 in green (Death by rust project) For Sale.
Alfa GTV TS ph2 in blue