Losing sprite quality when load .png from url

Hi everyone. I have problem with sprite quality after load png file from url. I use this code to load and set sprite on Image

 private IEnumerator RealLoadImage (string url, UnityEngine.UI.Image imageView) {
             if (imageCashe.ContainsKey (url)) {
                 if (imageView != null) {
                     imageView.sprite = imageCashe[url]; 
                 }
             } else {
                 //Call the WWW class constructor
                 WWW imageURLWWW = new WWW (url);  
             
                 //Wait for the download
                 yield return imageURLWWW;    
 
                 //Simple check to see if there's indeed a texture available
                 if(imageURLWWW.error == null){
                     if (imageURLWWW.texture != null) {
                     
                         //Construct a new Sprite
                         Sprite sprite = new Sprite ();     
                     
                         Texture2D image = new Texture2D(imageURLWWW.texture.width, imageURLWWW.texture.height, TextureFormat.ARGB32, true);
                         imageURLWWW.LoadImageIntoTexture(image);
                         image.SetPixels( image.GetPixels(0,0,image.width,image.height));
                         image.filterMode = FilterMode.Bilinear;
                         image.alphaIsTransparency = true;
                         image.Apply();
                         sprite = Sprite.Create(image, new Rect (0, 0, image.width, image.height), new Vector2(0,0));
 
                         if(!imageCashe.ContainsKey(url))
                         {
                             imageCashe.Add (url, sprite);
                         }
 
                         //Assign the sprite to the Image Component
                         if (imageView != null) 
                         {
                             imageView.sprite = sprite; 
                         }
                     }
                 }
                 else
                 {
                     Logger.LogError("Error to load img with url - " + url);
                     // делаем image прозрачным 
                     imageView.color = new Color(255,255,255,0);
                 }
                 imageURLWWW.Dispose ();
                 imageURLWWW = null;
             }
             imageView.enabled = true;
             yield return null;
         }

and get this result

But, if I download this png file manual, move on resource and set this file on image, i get this

Why so big different with this sprites? And how get smooth sprite on dynamic load? Version Unity 5.4.0f3 and last version 5.6 get this problem too. Thanks a lot)