The molecular structure of various semi-fluorinated polymers derived from tetrafluoroethylene, hexafluoropropylene, and vinylidenefluoride is examined by different characterization methods in dilute solution. The polymer synthesis was tailored to set up samples with a straight linear topography as well as model polymers with a controlled amount of long chain branching. As anticipated from the reaction kinetics of the polymerization process, the absolute molar mass distributions of the linear samples as obtained by size exclusion chromatography coupled with multiangle light scattering are well described by a Schulz-Zimm distribution. With [eta] similar to M-0.73 and < s(2)>(1/2) similar to M-0.53 in THF, scaling laws typical of coil dimensions of linear macromolecules in good solvents were observed. In the second set of samples, the presence of long-chain branching (LCB) becomes evident from a reduced radius of gyration in the high molar mass region. Solution viscometry on the polydisperse samples reveals a decreasing contraction factor g(eta) = [eta](br)/[eta](lin) of the intrinsic viscosity (equivalent to g' as introduced by Zimm and Kilb) with increasing amount of branching agent utilized in the polymer synthesis. The branching parameter epsilon determined from g(eta) together with the contraction factor of the radius of gyration g(s) = < s(2)>(br)/< s(2)>(lin) is found to be increasing from 0.5 for M < 106 g/mol to about 1.3 at higher molar masses, which is indicative of a topography change from a starlike to a comblike polymer architecture.