That leaves ~8,430 tanks SP's which had one of the following fates:
5. Found abandoned around Germany Austria for no apparent reason
To me, abandoned/left in factory does count as a loss. For all sides, especially if we are going to compare to Krivosheev, who even includes scrapped vehicles. German losses in January 1945:
Year 1945 - only January
Tanks: 707
StuG/Jagdpanzer: 727
Armoured cars: 41
SPW: 796
SP-guns: 141
BIV charge carriers: 6
Note that SPW vehicles do increase the total German losses by a lot.
There's no reason to believe that the months Feburary, March April each produced greater losses than January. Thus the figure of 6,936 losses endured from January to March 45 seems a lot more sensible.
Why not? after German offensive in Balaton area, the Soviets counted 968 tanks and SPG knocked out or abandoned. ~2,700 + ~2,800 for 1945 just seem too low. More offensives and big battles took place in Prussia, Poland and Central Germany.
Panzer units strength according to Jentz, the complete guide..., 1943-45, pag 247-248:
Strength of Panzer Units on the Eastern front on 15 March 1945:
StuG: 545
PzIVlg: 603
PzIV/70: 357
Flakpz: 97
PzV: 776
PzVI: 212
Total: 2590
Strength of Panzer Units on the Western front on 15 March 1945:
StuG: 126
PzIVlg: 59
PzIV/70: 77
Flakpz: 41
PzV: 152
PzVI: 28
Total: 483
Strength of Panzer Units in Italy on 15 March 1945:
StuG: 67
PzIVlg: 131
PzIV/70: 0
Flakpz: 21
PzV: 26
PzVI: 36
Total: 281
Total strength of Panzer units only: 3354.
And going back to topic, I don´t really understand all the criticism to T-34. By 1944 it was past its best but it was superior to German workhorse (Pz-IV), which had thin tracks, 50mm protection in the turret, and 30mm on the sides. By late 1944 they even eliminated electric motor to turn the turret. These are of course theoretical specs, the usual catalogue of sabotage and poor finish should be added for vehicles built late in the war.
If Soviets kept producing T-34 by late 1944/45 it was because it was not worth changing to T-44 considering the threats, it does not say a lot about the German tanks. Optics were better in T-34-85 than in Sherman according to Yugo officers, their units managed to get 95% availability by the way.
Finally, T-34 role changed during the war, in 1944 it was used in exploitation, where armor or fire power was not that critical. IS-2/ISU-122/152 and SU-100 provided support. Some T-34 units advanced 500kms in 3 days.
By the way, can anyone give the complete reference to Hahn? I might try to get it to have a look.