I have a Soma Rush Tange and a Felt F55 Alum/Carbon road bike (not sure how it compares to a TK1,2,3).

The Rush geometry is a great fit for me, it is stiff and very well made in my opinion. The drop outs are thick and the bottom bracket sits pretty high which is good for road use. The paint is thick but chips off in big pieces from high wear areas like the drop outs and seat post clamp areas. Mine has the stickers under the clearcoat which sucks if you're going for the low key factor.

The F55 is light and also fits me great, although not a comfortable as the Rush (I do ride this bike 3-4 times the distance than the Rush which could be the reason why). It's light and very fast but a little jumpy on harsh roads and not as stiff on steep climbs.

I'd say if you ride on flats, smooth roads or the track, get the Felt. If you ride on rough roads, paved trails, long distances get the Rush. Both are good bikes, cant really go wrong.