A
6 or 11k
move 75 is too small to be better

B.
stronger than me, i'd miss the connection under at move 29
the semeai was great too. I'd say 4d or better.

C
strange game, and no resign after the capture ?
too many mistakes, 11 or 18k, probably 18k

D
move 9 and subsequent excludes ddks.
I don't understand this game, so probably 7d or pro
Ends pretty close with regards to the captures and fight, so yeah, probably pro

E
starts strong, but then moves 54? 75?
and this isn't a blitz, so probably our 11k here

F
move 18 doesn't feel pro, but the result is good, so why not ?
I'd miss move 58, but doesn't it waste a ko threat ?

recap:
A: 6k
B: 4d
C: 18k
D: pro
E: 11k
F: 7d

C: very strong reading. very close to professional.
D: i didnt find any move that is wrong. excellent fuseki. definitly professional.
other..hurts my eye. ouch.

Game E was horrendous, so I'm going to say 18k.
For Game G, I don't want to imagine that anyone stronger than 11k would play a move like .

Game F feels sort of like how I played when I was ~6k, so I'll go with that. It didn't feel good, but it was a huge improvement over E and G.
I didn't really like Game A either, but it's better than the others so far, so I'll put it at 1k.

Game B was played with Canadian timing rules, so it's clearly not pro. I think it's 4-dan play, but I could be wrong and it may be the 7dan game.
Game C looks like a classic winner-take-all disaster game from high-dan KGS play. It's pretty unlikely that a pro would fall into this situation.

That leaves Game D as the pro game. I already suspected this was the pro game from the high-caliber to the good shape both players fought for, so when I noticed there were no time limits posted in the SGF for this game it only made me more sure.

Games A and G have a komi of 0.5, this suggests to me it's highly unlikely they would be professional. (=

Obvious things:
Time constraints: Game D is the only game without time settings listed, therefore is the only game which came from some place other than KGS. Doesn't preclude it from being a club match, but I'm betting it's the only pro game.

A - 7d - Some very interesting use of tenuki, good joseki knowledge, dynamic fuseki. Would also believe 4d, but not below, and definitely not pro.
B - 4d - Feels weaker than 4d, but it's weaker to my eyes than "a" and it's the only thing left. Some very strong reading, but also reading blunders.
C - 1k - Seriously overplays, missed opportunities, aji keshi, horrible shape, but patches of strong reading.
D - pro - Modern common professional fuseki, interesting/complicated sacrifices, no needless moves.
E - 18k - Made my eyes bleed.
F - 6k - Overplay, aji-keshi, not great reading, but followed a reasonable flow and idea in principle.
G - 11k - Some really horrible misreads, but most moves had some purpose.

i am kgs 4 dan and game A look horrorable. full of wrong timing move and mistakes.
and you say they might be 7d...

then again..i might be wrong and its not the first time...

I considered it stronger than B and C, and E-G are in my mind all clearly the weakest games. I found a number of sequences in A to be very interesting, such as to - this is not the play of a kyu player to me. The final kill was also too well read for a kyu player.

I wanted to put this down as 4d, but moves like in game B followed by being completely beaten up in the middle makes me consider B a weaker game than A.

In Game C, seems like gross overplay for an extra 4 or 5 points with a huge huge cost if you misread makes it feel like kyu overplay. 20 seconds to work out whether or not to connect at R17, and not a net seem like kyu play again. High dans would play at K12 rather than peep a bamboo, and no dan would play and surely?

Dusk Eagle with all of them correct

Game A 1k vs 1d (my game lol)
Game B 4d
Game C 7d
Game D Pro (Cho Cheolan vs Jiang Wei Jie at the 15th LG Cup)
Game E 18k
Game F 6k
Game G 11k