Hello Moon,
I don't know how knowledgable you are about monitors and I am not by any means,a professional recording engineer myself,but I will say that there is an incredible amount of variables & factors for what makes an exceptional monitor,as well as achieving the best results for your monitors to serve you well,by monitor placement,room size & acoustical conditions.
I'm guessing that you either have the Samson Resolv 65a's or the 80a's?
If this is the case,then I am to assume that you have a medium sized room?
If I am reasonably close in my raw estimations of your situation,then I would say that the Genelec 8020a's are not right for you.While they are exceptional speakers
in many respects,they are too small for your room-even with a subwoofer added in.
Given thier size,the bass response is fair,but not a broad enough frequency range on the low end,especially compared to your Samson's range.
Secondly,the dispertion pattern of a dome tweeter is limited,& especially lacking in a medium to large size room.
Also,dome tweeters in this price range do not have alot of accuracy & durablity,in comparison to other designs of tweeters in a higher price range.
Another thing to take note of,is that under extreme conditions, such as loud volumes for prolonged periods of time,will eventually cause titanium in the dome tweeter to "work harden"-meaning that while titanium is strong & flexible-it will eventually become brittle over time,after having been subjected to temperature differentials-resulting in deterioration of accuracy.
I own a pair of Adam A7's,but I have no basis for comparison between these & the Dynaudio's,Blue Sky & the Mackie's-as I have not listened to those 3 brands,but if you want to talk about "bang for the buck",I think that the Adams are the best value out there for what you get,at a $1,000 per pair-which is why I made the decision to buy the Adams-without even hearing them first,because I was so impressed with the info I had found on these monitors-based on online research!
With regard to mixing & mastering,I am obviously no expert,but I will say this about the Adams,when you consider all of the research & development,thier exclusive patented technolgy & high quality design,components & materials that make these wonderful monitors what they are-which are impeccably accurate,versatile & durable-all at a great price point,due to the fact that they are designed in Germany,but manufactured in another country with a much favorable currency exchange.
The A7 model is the only one to be outsourced to another country which means that a pair of these monitors would have been easliy twice as much,if they were also manufactured in Germany.
The best way I know to describe these incredible monitors is this;
A carbon fiber/rohacell foam sandwich for the woofer,which makes the bass driver incredible light & durable with great dialectric properties,resulting in exceptional accuracy.
Equally accurate,is the folded ribbon tweeters made of nomex,which is a very durable material-also used by NASA-giving the tweeters a very broad frequency range,resulting in very accurate & resilliant tweeters.
A key element in measuring the sonic qualties of a speaker is the speaker's ability to move air.The Adams push 4 times as much air than the typical monitor.
Another way for me to better describe how stunning these monitors are is to give you this analogy;
If you take a paper clip & throw it with an outstretched arm across the room,versus taking a paper clip & placing it on your hand & flicking it with your thumb & forefinger,which method will send the paper clip the furthest with the least amount of physical energy applied?
Obviously there is no contest between the two.
This is how efficient & accurate these monitors are!
Also they deliver so much bass,clarity & volume for thier compact size,that you will not believe your ears!
They have 6.5 inch woofers in them,but they sound much bigger and they are perfect for medium sized rooms.
They also have front mounted power & volume controls & and room modification controls in the back of them.
I cannot say enough good things about these monitors,as they made an astonishing difference in my mixes & mastering.
Of course,the subject of monitors is a very objective one & to each his own,but just giving you more food for thought.
I hope my input helped you.