Great field of view but sharpness at edges is lacking - Sightmark Solitude 7x36 XD Binoculars

Very wide field of view makes spotting birds etc very easy. The sweet spot appears to be about 60% of the FOV. When scanning with this binocular I find the blurry edges visually disturbing. Others may not notice this. I get a more comfortable view and ease with my Bushnell 8x42 engage and especially my Bushnell Forge 8x42's. I also compared it to the KOWA 6.5 x 32'a and found the Kowa slightly better. The Kowa has a wider field of view and closer focus. I would give the Kowa a 4 star rating. The Sightmark has good clarity and resolution in it's sweet spot. For the same price look at the Busnell Engage 8x42's or the Kowa 6.5 x 32's