Now now, it's extremely important not to mix Winter War and Continuation War.
In Winter War Finland had only a small air force, and large number of the operational fighters the FAF possessed were obsolete. Before Continuation War most of Finnish fighters were from Allied nations (Gladiator, Morane, Brewster) and some from Italy (G.50), but Finland never received fighters from Germany before the second war with Soviet Union had started. Even then Hitler was reluctant at giving Finland equipment - Germany never gave state-of-the-art equipment to its allies - and Bf109s were received only after hard bargaining. The same applies to StuG assault guns and the German anti-tank weapons.
About the troop quantity and casualty figures:
In Winter War Finland mobilized 337,000 men. Soviet Union started the war with 520,000 men and at its peak the Soviet Union had over 1 million soldiers in the Finnish front. The casualties were (quite accurately for Finland) 26,700 dead and 44,000 wounded, while Soviet Union lost nearly 300,000 men as either dead, wounded or missing.
In Continuation War the Finnish Defence Forces had 475,000 men in total. In 1941 they were faced with some 300,000 Soviet soldiers. In 1944 the Soviet manpower in the Finnish front was a little over 600,000 men. Finland lost 65,000 as KIA and 142,000 as WIA. Soviet losses were at least four times as big (alone in Tali-Ihantala the Soviets lost over 60,000 men).
I don't know how this discussion led to this (and discussion about some Central European cities, Yugoslavian army sizes, etc.) as the original issue was simply about Finland having an ahistorical border when it declares war on Soviet Union.